Q: Which equation is used to calculate the equilibrium potential for a single ion across a membrane?

$$E = \frac{RT}{zF} \ln \left( \frac{[\text{ion}]_{\text{out}}}{[\text{ion}]_{\text{in}}} \right)$$

Q: A patient with chronic obstructive pulmonary disease (COPD) has difficulty with gas exchange. Which equation best describes the rate of diffusion of gases across the alveolar membrane?

$$V = D \times A \times \frac{(P_1$ - P_2$)}{T}$$

Question 1

Which of the following best describes the primary function of membrane potentials in excitable cells?

Accepted Answer

To enable rapid transmission of electrical signals for communication

Question 2

A patient presents with muscle weakness due to impaired synaptic transmission. Which neurotransmitter is most likely deficient at the neuromuscular junction?

Accepted Answer

Acetylcholine

Question 3

During an action potential, which ion's movement is primarily responsible for the rapid depolarization phase?

Accepted Answer

Sodium ions ($$\mathrm{Na^+}) $$moving into the cell

Question 4

Which equation is used to calculate the equilibrium potential for a single ion across a membrane?

Accepted Answer

$$E = \frac{RT}{zF} \ln \left( \frac{[	ext{ion}]_{	ext{out}}}{[	ext{ion}]_{	ext{in}}} ight)$$

Question 5

A patient with hyperkalemia (elevated $$\mathrm{K^+} in $$the blood) is at risk for cardiac arrhythmias. Which physiological principle explains this risk?

Accepted Answer

Increased extracellular $$\mathrm{K^+}$$ reduces the resting membrane potential, making cells more excitable

Question 6

Which of the following best describes the role of the sodium-potassium pump ($$\mathrm{Na^+/K^+}$$ ATPase) in cell physiology?

Accepted Answer

It actively transports $$\mathrm{Na^+}$$ out and $$\mathrm{K^+}$$ into the cell, maintaining ionic gradients

Question 7

A patient is unable to maintain balance when standing with eyes closed. Which sensory system is most likely impaired?

Accepted Answer

Vestibular system

Question 8

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

Accepted Answer

The greater the end-diastolic volume, the greater the force of contraction

Question 9

Which formula correctly represents cardiac output ($$CO$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 10

A patient with chronic obstructive pulmonary disease (COPD) has difficulty with gas exchange. Which equation best describes the rate of diffusion of gases across the alveolar membrane?

Accepted Answer

$$V = D 	imes A 	imes \frac{(P_1$ - P_2$)}{T}$$

Question 11

Which hormone is primarily responsible for increasing blood glucose levels during fasting?

Accepted Answer

Glucagon

Question 12

A patient with diabetes insipidus is unable to concentrate urine. Which hormone is most likely deficient?

Accepted Answer

Antidiuretic hormone (ADH)

Question 13

Which of the following best describes the Bohr effect in hemoglobin physiology?

Accepted Answer

Increased $$\mathrm{CO_2$}$$ and decreased pH reduce hemoglobin's affinity for oxygen

Question 14

Which equation is used to calculate mean arterial pressure ($$MAP$$)?

Accepted Answer

$$MAP = \frac{1}{3} (SBP - DBP) + DBP$$

Question 15

A patient with metabolic acidosis has a blood pH of 7.20. Which buffer system is most important in maintaining blood pH?

Accepted Answer

Bicarbonate buffer system

Question 16

Which of the following is a correct sequence of events in skeletal muscle contraction?

Accepted Answer

Release of calcium from sarcoplasmic reticulum $$\rightarrow$$ binding of calcium to troponin $$\rightarrow$$ cross-bridge formation

Question 17

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

Accepted Answer

Decreased metabolic rate and weight gain

Question 18

Which of the following best describes the role of aldosterone in renal physiology?

Accepted Answer

It increases sodium reabsorption in the distal tubule

Question 19

Which of the following is a correct formula for calculating glomerular filtration rate ($$GFR$$)?

Accepted Answer

$$GFR = K_f 	imes [(P_{GC} - P_{BS}) - (\pi_{GC} - \pi_{BS})]$$

Question 20

A patient with Addison's disease has low cortisol and aldosterone levels. Which of the following symptoms is most likely?

Accepted Answer

Hypotension and hyponatremia

Anatomy & Physiology I: Course Topics and Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard