Question 1

Which of the following best describes the mechanistic approach to explaining physiological processes?

Accepted Answer

It describes the underlying physical and chemical mechanisms responsible for a process.

Question 2

A patient with Tay-Sachs disease has a deficiency in which cellular organelle, leading to the accumulation of undigested lipids in neurons?

Accepted Answer

Lysosome

Question 3

Which of the following statements about the Na\+/K\+ pump is correct?

Accepted Answer

It moves 3 Na\+ ions out of the cell and 2 K\+ ions into the cell per ATP hydrolyzed.

Question 4

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-5}$$ M. What is its pH?

Accepted Answer

$$pH = 5$$

Question 5

Which of the following best describes the role of surfactant in the alveoli?

Accepted Answer

It decreases surface tension, making it easier for the lungs to expand during inspiration.

Question 6

Which of the following is a correct sequence for the pathway of light entering the eye to the point of visual processing?

Accepted Answer

Cornea → Lens → Retina → Optic nerve → Thalamus → Visual cortex

Question 7

Which of the following best explains why red blood cells (RBCs) have a limited lifespan?

Accepted Answer

They lack a nucleus and most organelles, preventing repair and division.

Question 8

A patient presents with muscle weakness and fatigue. Laboratory results show low plasma potassium and high plasma sodium. Which process is most likely impaired?

Accepted Answer

Function of the Na\+/K\+ pump

Question 9

Which hormone is secreted by the alpha cells of the pancreas and increases blood glucose levels by stimulating glycogenolysis and gluconeogenesis?

Accepted Answer

Glucagon

Question 10

Which of the following best describes the all-or-none principle of the neuronal action potential?

Accepted Answer

Once threshold is reached, an action potential of fixed size is always generated.

Question 11

Which of the following is a peptide hormone produced by the anterior pituitary gland?

Accepted Answer

Growth hormone

Question 12

A patient with hyperthyroidism is likely to experience which of the following symptoms?

Accepted Answer

Weight loss, heat intolerance, and increased heart rate

Question 13

Which of the following best describes the function of erythropoietin?

Accepted Answer

Stimulates red blood cell production in the bone marrow

Question 14

Which of the following is true regarding the difference between exergonic and endergonic reactions?

Accepted Answer

Exergonic reactions release energy, while endergonic reactions require energy input.

Question 15

Which of the following best describes the function of the Golgi apparatus in protein synthesis?

Accepted Answer

It modifies, sorts, and packages proteins for secretion or delivery to other organelles.

Question 16

Which of the following is a correct statement about the distribution of ions across the cell membrane at rest?

Accepted Answer

The concentration of Na\+ is higher outside the cell, and K\+ is higher inside the cell.

Question 17

Which of the following best describes the difference between nuclei and ganglia in the nervous system?

Accepted Answer

Nuclei are clusters of neuron cell bodies in the central nervous system, while ganglia are in the peripheral nervous system.

Question 18

Which of the following best explains why enzymes lower the activation energy of a reaction?

Accepted Answer

They provide an alternative reaction pathway with a lower activation energy.

Question 19

Which of the following is a function of platelets in the blood?

Accepted Answer

Initiating blood clot formation

Question 20

A person is exposed to a placebo in a clinical trial. Which of the following best describes the placebo effect?

Accepted Answer

A physiological response to an inactive substance due to the individual's expectations.

Comprehensive Study Notes for Human Physiology 261 Midterm

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