Question 1

Which structure in the eye is responsible for high-resolution color vision, and what would be the likely consequence of its dysfunction?

Accepted Answer

Cones; decreased ability to distinguish colors and reduced visual acuity

Question 2

A patient presents with symptoms of excessive thirst and frequent urination. Laboratory tests reveal low ADH levels. Which gland and hormone are most directly involved, and what is the physiological effect?

Accepted Answer

Posterior pituitary; ADH; decreased water reabsorption in kidneys

Question 3

During a routine blood test, a patient is found to have low albumin levels. What is the most likely consequence regarding fluid balance, and which equation best describes the relationship between osmotic pressure and albumin concentration?

Accepted Answer

Decreased osmotic pressure, resulting in edema; $$\Pi = RTC$$

Question 4

Which heart valve prevents backflow of blood into the left atrium during ventricular contraction, and what would be the clinical consequence of its failure?

Accepted Answer

Mitral valve; pulmonary congestion due to regurgitation

Question 5

A sudden decrease in blood vessel diameter in the arterioles will most significantly affect which aspect of blood flow, and which equation quantifies this relationship?

Accepted Answer

Increase in peripheral resistance; $$R \propto \frac{1}{r^4$}$$

Question 6

A patient with a splenic injury is at increased risk for which of the following, and why is the spleen considered the largest lymphoid organ?

Accepted Answer

Impaired blood filtration and increased susceptibility to infection; it cleanses blood of aged cells and debris

Question 7

Which immune cell is primarily responsible for directly destroying infected or cancerous cells, and what is the mechanism of action?

Accepted Answer

Cytotoxic T cell; releases perforin and granzymes to induce apoptosis

Question 8

According to Boyle’s Law, what happens to the pressure in the lungs when the thoracic volume increases during inspiration, and which equation represents this relationship?

Accepted Answer

Pressure decreases; $$P \propto \frac{1}{V}$$

Question 9

A patient with a deficiency in intrinsic factor is likely to develop which condition, and what is the underlying mechanism?

Accepted Answer

Pernicious anemia; impaired absorption of vitamin B12 in the small intestine

Question 10

Which hormone primarily controls the basal metabolic rate (BMR), and what would be the effect of its deficiency?

Accepted Answer

Thyroxine; decreased BMR and weight gain

Question 11

During urine formation, which process is responsible for returning 99% of filtrate to the blood, and what would be the consequence of its failure?

Accepted Answer

Tubular reabsorption; excessive loss of water and nutrients in urine

Question 12

If a patient’s blood pH drops to 7.25, which buffer system is most likely to respond first, and what is the chemical equation for the bicarbonate buffer system?

Accepted Answer

Chemical buffer system; $$\mathrm{CO_2$} + \mathrm{H_2O} \leftrightarrow \mathrm{H_2CO_3} \leftrightarrow \mathrm{H^+} + \mathrm{$$HCO_3$$^-}$$

Question 13

Which cation is most abundant in the extracellular fluid (ECF), and what is its primary physiological role?

Accepted Answer

Sodium (Na+); regulating fluid balance and nerve impulse transmission

Question 14

During the female reproductive cycle, which phase follows ovulation, and what hormone is predominantly secreted during this phase?

Accepted Answer

Luteal phase; progesterone

Question 15

A male patient has low sperm motility and acidic urine. Which accessory gland secretion is most likely deficient, and what is its function?

Accepted Answer

Prostate gland secretion; neutralizes acidic urine and enhances motility

Question 16

During early pregnancy, which hormone is secreted by the placenta to maintain the corpus luteum, and what is its primary function?

Accepted Answer

hCG; maintains progesterone production to sustain the uterine lining

Question 17

Gastrulation during week 3 of embryonic development results in the formation of which structures, and why is this process critical?

Accepted Answer

Three primary germ layers (ectoderm, mesoderm, endoderm); establishes the foundation for all organ systems

Question 18

A patient with uncontrolled diabetes has elevated blood glucose levels. Which pancreatic hormone is deficient, and what is the equation for glucose regulation?

Accepted Answer

Insulin; $$	ext{Blood Glucose} \uparrow \Rightarrow 	ext{Insulin} \uparrow \Rightarrow 	ext{Blood Glucose} \downarrow$$

Question 19

Which structure in the small intestine increases surface area for absorption by the greatest factor, and what is the combined effect of all adaptations?

Accepted Answer

Circular folds, villi, and microvilli; increases surface area 600x

Anatomy & Physiology: Special Senses, Endocrine, Blood, Cardiovascular, Lymphatic, Respiratory, Digestive, Metabolism, Urinary, Fluid Balance, Reproductive, and Development

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