Question 1

Which of the following best describes the primary function of the sodium-potassium pump ($$Na^+/K^+$$ ATPase) in maintaining cellular homeostasis?

Accepted Answer

It actively transports $$Na^+$$ out of the cell and $$K^+$$ into the cell, using ATP.

Question 2

A patient is experiencing muscle weakness and irregular heart rhythms. Blood tests reveal hypokalemia (low $$K^+). $$Which physiological process is most directly affected by this condition?

Accepted Answer

The generation and propagation of action potentials in neurons and muscle cells.

Question 3

During the process of synaptic transmission, which event occurs immediately after an action potential reaches the axon terminal?

Accepted Answer

Voltage-gated $$Ca^{2+}$$ channels open, allowing $$Ca^{2+}$$ influx.

Question 4

Which of the following best explains why red blood cells placed in a hypotonic solution will swell and potentially burst?

Accepted Answer

Water moves into the cell by osmosis due to a higher solute concentration inside the cell.

Question 5

A person is hyperventilating due to anxiety. Which acid-base disturbance are they most at risk for, and what is the physiological mechanism?

Accepted Answer

Respiratory alkalosis; excessive loss of $$CO_2$$ decreases $$H^+$$ concentration.

Question 6

Which of the following equations correctly represents the relationship between $$CO_2$$, water, and acid-base balance in the body?

Accepted Answer

$$CO_2 + H_2O$$ \rightarrow H_2CO_3 \rightarrow H^+ + $$HCO_3$$^-$$

Question 7

A patient with chronic kidney disease is unable to efficiently excrete $$H^+$$ ions. What acid-base imbalance are they most likely to develop?

Accepted Answer

Metabolic acidosis

Question 8

Which of the following best describes the role of the glomerulus in the nephron?

Accepted Answer

It filters blood plasma, allowing water and small solutes to enter the nephron while retaining blood cells and large proteins.

Question 9

Which of the following statements about the resting membrane potential of a neuron is correct?

Accepted Answer

It is primarily established by the differential permeability of the membrane to $$K^+$$ and $$Na^+$$ ions and the activity of the $$Na^+/K^+$$ ATPase.

Question 10

A patient is diagnosed with Type 1 diabetes mellitus. Which hormone is deficient, and what is the primary effect on blood glucose regulation?

Accepted Answer

Insulin; decreased uptake of glucose by cells, leading to hyperglycemia.

Question 11

Which of the following best explains the Frank-Starling law of the heart?

Accepted Answer

The greater the stretch of cardiac muscle fibers during filling, the greater the force of contraction during systole.

Question 12

A person with a blocked coronary artery is at risk for which of the following conditions, and why?

Accepted Answer

Myocardial infarction; lack of oxygen delivery to cardiac muscle cells.

Question 13

Which of the following best describes the process of diffusion as it applies to gas exchange in the alveoli?

Accepted Answer

Oxygen and carbon dioxide move down their partial pressure gradients across the alveolar-capillary membrane.

Question 14

Which of the following equations represents the calculation of cardiac output ($$CO$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 15

A patient is found to have a blood pH of 7.25. Which of the following best describes this condition and a likely physiological cause?

Accepted Answer

Acidosis; accumulation of $$CO_2$$ due to hypoventilation.

Question 16

Which of the following best explains why the kidneys play a critical role in long-term regulation of blood pressure?

Accepted Answer

They regulate blood volume by adjusting sodium and water reabsorption.

Question 17

Which of the following is a correct statement about the role of hemoglobin in oxygen transport?

Accepted Answer

Hemoglobin binds oxygen in the lungs where $$pO_2 is $$high and releases it in tissues where $$pO_2 is $$low.

Question 18

A person is exposed to a toxin that inhibits acetylcholinesterase at the neuromuscular junction. What is the most likely effect on muscle contraction?

Accepted Answer

Prolonged muscle contraction due to continuous stimulation by acetylcholine.

Question 19

Which of the following best describes the process of secondary active transport in the nephron?

Accepted Answer

Glucose is reabsorbed from the filtrate into the blood by coupling its transport to $$Na^+$$ movement down its gradient.

Anatomy & Physiology I: Course Syllabus and Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard