BIOL121 Assignment 3: Written Assessment — Human Anatomy and Physiology Essay

Undergraduate anatomy and physiology students can demonstrate integrated knowledge of normal human body systems by analyzing clinical scenarios involving respiration, renal function, digestion, and pharmacology through structured 1200-word essays with proper academic referencing.

Due date: Tuesday 8th June 2021 4.00pm

Weighting: 35%

Length and/or format: 1200-word written essay

Purpose: The essay allows you to demonstrate your integrated knowledge of the anatomical and physiological workings of the healthy human body.

Instructions

Choose ONE of the three scenarios provided. Carefully read all materials provided for your chosen scenario. Use the Word template provided to complete your essay on your chosen scenario. You will need to research the topic beyond your lecture and workshop material. It is highly recommended that you start with the textbook.

Include in text citations in your essay and a reference list at the end.

How to Submit

Submit online through the Turnitin link provided on LEO. For submission please name the file with your student number and scenario topic e.g. S00123456_JANE

Important to Note

You MUST write an essay and your answers MUST relate to the person in your chosen scenario.

• This assessment involves addressing a series of topics in the form of an essay. The topics relate directly to the scenarios presented.
• Your discussion must be specific for the person in your chosen scenario, marks will not be given where your essay does not relate to the person in the scenario.
• The topics addressed in your chosen scenario must be integrated into an essay, which should include an appropriate introduction and conclusion.
• You can present the information in the order that you feel flows best; you don’t have to present it in the order the topics are listed.
• Your discussion of key points must be incorporated into sentences and paragraphs that include facts from your chosen scenario. If presented in question-answer style no marks will be given for quality of essay.

The purpose of this assessment is for you to demonstrate your knowledge and understanding of NORMAL anatomy and physiology.

• Do not become distracted describing pathophysiological changes
• Do not simply list clinical signs and symptoms.
• Ensure you adequately explain relevant underlying anatomy and physiology.

Scenario: Pierre

Pierre is a 50yo male who has made an appointment to see his GP for his biannual health check. He tells the doctor that he has been feeling “a bit puffed” walking around the course during his weekly game of golf. Pierre reports he has gained nine kilos since his 40th birthday, and his waist measurement has expanded. He laughs this off as “middle aged spread”, and says his wife tells him he needs to watch what he eats and drink less alcohol. He works as a journalist for a local paper, which he has been finding very stressful of late, and spends a lot of his time in the office sitting in front of a computer, snacking.

Pierre has recently decided to give up smoking, and wonders if this has contributed to his weight gain. He regularly chews nicotine gum when he craves a cigarette.

Physical examination:

Urinalysis:

Topics and Key Points

All topics and their key points listed below need to be discussed in your essay

Topic 1: Respiration (8 marks total)

Pierre is late for work and the lift is broken; he must run up 6 flights of stairs to make it on time.

Question 1a (5 marks): Describe the changes in volume and pressure that will be occurring in Pierre’s chest cavity to achieve exhalation while running up the stairs. Explain why these changes are occurring, and the effect upon airflow.

Question 1b (3 marks): Describe the gas exchange occurring between air in Pierre’s blood and the skeletal muscles in his legs. Discuss how the rate of gas exchange was affected during the run up the stairs (i.e., during exercise).

Topic 2: Renal (5 marks total)

Question 2 (5 marks): Evaluate Pierre’s urinalysis. Using your knowledge of normal kidney function and urine formation, explain any abnormal values, and the possible underlying mechanisms.

Topic 3: Digestion/metabolism (10 marks total)

After speaking to his doctor, Pierre has decided to try to lose weight. He has decided to cut out fat from his diet but has not changed his carbohydrate intake.

Question 3a (2 marks): Discuss the importance of maintaining adequate fat intake.

Question 3b (4.5 marks): Discuss the mechanical and chemical events required for Pierre to absorb the ingested carbohydrates.

Question 3c (3.5 marks): Pierre is having a TV dinner and enjoying his high carbohydrate/low fat meal. State the hormone that is most active in maintaining Pierre’s blood glucose levels at this time. Explain your answer.

Topic 4: Pharmacology (7 marks total)

Pierre indicated he has used nicotine gum to overcome his cigarette cravings.

Question 4a (4 marks): Discuss the route of administration, how the drug is likely to be absorbed after administration, and its likely bioavailability. Justify your response by discussing whether the drug would be subjected to hepatic first pass.

Question 4b (3 marks): Discuss the importance of the half-life of a drug. Assuming there is 100% absorption, and the half-life of nicotine is 2 hours, calculate the % amount of drug that is likely to be present in Pierre’s blood after 12 hours.

Sample Paper Writing Help Response

A student completing this essay on Pierre’s scenario might begin by establishing that during forced exhalation while running upstairs, Pierre’s internal intercostal muscles and abdominal wall muscles contract actively rather than relaxing passively. This contraction reduces thoracic volume by pulling the rib cage downward and inward while pushing the diaphragm upward, thereby increasing intrapulmonary pressure above atmospheric pressure and forcing air out of the lungs. According to The Physiology of Exercise, Boyle’s Law governs these pressure-volume relationships; during exhaustive exercise, intrapulmonary pressure can decrease by up to 100 mmHg during inspiration, with reciprocal increases during forced expiration [^67^].

Gas exchange at Pierre’s skeletal muscles intensifies during stair climbing as oxygen consumption and carbon dioxide formation increase up to 20-fold during strenuous exercise [^67^]. The partial pressure gradient drives oxygen from hemoglobin into muscle tissues while carbon dioxide diffuses from metabolically active cells into the blood. The rate of gas exchange accelerates because increased cardiac output delivers more blood to pulmonary capillaries per minute, and the elevated tissue metabolism maintains steeper partial pressure gradients between blood and active muscle cells.

Regarding Pierre’s urinalysis, students should recognize that normal kidney function limits urinary protein excretion to less than 150 mg/day, with albumin accounting for approximately 30 mg/day maximum [^72^]. The glomerular basement membrane normally prevents larger protein molecules from passing into the filtrate, while proximal tubules reabsorb any filtered proteins. Abnormal values would indicate disruptions in either glomerular filtration barrier integrity or tubular reabsorption capacity.

For carbohydrate digestion, mechanical breakdown begins with chewing in the oral cavity where salivary amylase initiates starch hydrolysis into maltose and dextrins. Upon reaching the stomach, chemical carbohydrate digestion ceases because acidic pH denatures amylase, though mechanical mixing continues forming chyme. The small intestine hosts the primary digestive phase where pancreatic amylase and brush border enzymes including maltase, sucrase, and lactase complete hydrolysis into absorbable monosaccharides [^70^]. Glucose and galactose then undergo secondary active transport via SGLT1 carriers, while fructose crosses via facilitated diffusion through GLUT5 transporters.

After Pierre’s high-carbohydrate meal, insulin represents the dominant hormone maintaining blood glucose homeostasis. Rising plasma glucose concentrations stimulate pancreatic beta-cell insulin secretion, which promotes hepatic glycogen synthesis and peripheral glucose uptake into skeletal muscle and adipose tissue [^73^]. In healthy individuals, plasma glucose peaks approximately 60 minutes postprandially, rarely exceeding 140 mg/dl, and returns to preprandial levels within 2-3 hours [^78^]. Insulin simultaneously suppresses hepatic glucose production through inhibition of glycogenolysis and gluconeogenesis.

Nicotine from chewing gum undergoes buccal absorption across the oral mucosa, a route that partially avoids hepatic first-pass metabolism. Research indicates that extraction of nicotine from gum averages 53-72% depending on dosage strength, with swallowed nicotine subject to extensive first-pass hepatic metabolism reducing bioavailability to 30-40% [^74^]. The buccal route achieves more rapid systemic delivery than gastrointestinal absorption because the drug enters circulation before reaching the portal system. With a 2-hour half-life and 100% absorption assumption, approximately 1.56% of the original nicotine dose remains after 12 hours (four half-lives: 100% → 50% → 25% → 12.5% → 6.25% → 3.125% → 1.56%).

Discussion: Respiratory Mechanics in Exercise

Understanding respiratory mechanics requires appreciation of the accessory muscles recruited during exertion. While the diaphragm and external intercostals suffice for quiet breathing, forced expiration during stair climbing engages the internal intercostals, external oblique, internal oblique, and transverse abdominis muscles [^67^]. These muscles actively decrease thoracic dimensions rather than allowing passive elastic recoil. The resulting pressure changes create airflow rates substantially exceeding resting ventilation; maximal ventilation can reach 100-200 L/min depending on body size, compared to approximately 6 L/min at rest.

The ventilatory threshold marks a transition point where ventilation increases disproportionately relative to oxygen consumption, typically occurring at 50-70% of maximal oxygen uptake [^67^]. Beyond this threshold, carbon dioxide accumulation from anaerobic metabolism stimulates chemoreceptors in the medulla and carotid bodies, driving further respiratory compensation. Pierre’s sedentary occupation and recent weight gain likely elevate his ventilatory threshold, explaining why he experiences dyspnea during relatively modest exertion like golf course walking. Regular aerobic conditioning can lower the ventilatory threshold and improve exercise tolerance through enhanced respiratory muscle efficiency and cardiovascular adaptation.

: Drug Half-Life Calculations

Half-life calculations assume first-order elimination kinetics where a constant fraction of drug is cleared per unit time rather than a constant amount. For nicotine with its 2-hour half-life, six half-lives (12 hours) reduce plasma concentration to approximately 1.56% of the initial value. Clinical pharmacology emphasizes that five half-lives generally achieve 97% elimination, considered functionally complete for most therapeutic purposes. However, nicotine presents complexity because its metabolite cotinine possesses a substantially longer half-life of 15-20 hours, meaning nicotine use biomarkers persist for days after the parent compound disappears.

Students often confuse half-life with duration of action; these concepts differ because pharmacological effects depend on receptor occupancy thresholds rather than plasma concentrations alone. Nicotine’s cardiovascular and central nervous system effects may persist beyond predicted pharmacokinetic disappearance due to receptor desensitization and redistribution phenomena. Furthermore, interindividual variability in CYP2A6 enzyme activity creates substantial variation in nicotine metabolism rates between patients, complicating standardized dosing predictions [^65^]. Chronic nicotine exposure induces enzyme upregulation, meaning experienced users may clear nicotine faster than naive individuals despite identical dosing.

References

1. Benowitz, N.L., et al. (1987) ‘Determinants of nicotine intake while chewing nicotine polacrilex gum’, Clinical Pharmacology and Therapeutics, 41(4), pp. 467-473. Available at: https://pubmed.ncbi.nlm.nih.gov/3829583/
2. Merck Manual Professional Edition (2024) ‘Proteinuria’, Nephrology. Available at: https://www.merckmanuals.com/professional/nephrology/symptoms-of-nephrologic-disorders/proteinuria
3. Physiology of Exercise (2025) ‘The Respiratory System’, Pressbooks. Available at: https://saalck.pressbooks.pub/physioex/chapter/154/
4. StatPearls (2022) ‘Physiology, Digestion’, NCBI Bookshelf. Available at: https://www.ncbi.nlm.nih.gov/books/NBK544242/
5. University of Hawai’i at Mānoa (2024) ‘Carbohydrate Digestion and Absorption’, Nutrition and Fitness. Available at: https://pressbooks.calstate.edu/nutritionandfitness/chapter/carbohydrate-digestion-and-absorption/

Study topics examples

1. BIOL121 Assignment 3 Pierre scenario essay respiration renal digestion pharmacology
2. BIOL121 Written Assessment: Normal Anatomy and Physiology Essay with Harvard Referencing
3. Anatomy and physiology essay patient scenario Pierre
4. How to write the BIOL121 Pierre scenario essay on respiration, renal function, and metabolism

Write a 1,200-word essay analyzing Pierre’s clinical scenario covering respiratory mechanics during exercise, renal function and urinalysis interpretation, carbohydrate digestion and absorption, insulin regulation of blood glucose, and nicotine pharmacokinetics including buccal absorption and half-life calculations. Submit via Turnitin using the specified file naming convention.

Complete a 3-4 page written assessment demonstrating integrated knowledge of normal human anatomy and physiology through analysis of a 50-year-old male patient scenario. Address respiration (8 marks), renal function (5 marks), digestion and metabolism (10 marks), and pharmacology (7 marks) with proper Harvard referencing and essay structure including introduction and conclusion.

Analyze Pierre’s health check scenario in a 1200-word essay covering exercise respiration, kidney function, carbohydrate digestion, insulin regulation, and nicotine pharmacology for BIOL121 anatomy and physiology assessment.

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BIOL121 Assignment 4: Endocrine and Cardiovascular Integration Case Study

Building upon your knowledge of normal physiology from Assignment 3, analyze a comprehensive case study involving a 45-year-old female with suspected thyroid dysfunction and early-stage cardiovascular changes. Your 1,500-word report must integrate endocrine regulation of metabolism with cardiac electrophysiology and vascular hemodynamics. Specifically address: (1) the hypothalamic-pituitary-thyroid axis and feedback mechanisms; (2) electrocardiogram interpretation including normal conduction pathways; (3) blood pressure regulation and the role of baroreceptors; and (4) integration of these systems in maintaining homeostasis during stress and exercise. Include at least six peer-reviewed references in Harvard format and submit via Turnitin by the specified deadline.

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