Q: Which equation correctly represents the calculation of plasma osmolarity?

$$\text{Plasma Osmolarity} = 2 \times [\text{Na}^+] + [\text{Glucose}] + [\text{BUN}]$$

Q: Which of the following is a correct statement about the Nernst equation for calculating equilibrium potential?

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

Question 1

Which of the following best describes the role of negative feedback in maintaining homeostasis in the human body?

Accepted Answer

It reverses deviations from a set point, promoting stability.

Question 2

A patient presents with hyponatremia (low plasma sodium). Which of the following cellular compartments will be most affected by this condition?

Accepted Answer

Plasma

Question 3

Which equation correctly represents the calculation of plasma osmolarity?

Accepted Answer

$$	ext{Plasma Osmolarity} = 2 	imes [	ext{Na}^+] + [	ext{Glucose}] + [	ext{BUN}]$$

Question 4

Which of the following is NOT a component of a negative feedback system?

Accepted Answer

Amplifier

Question 5

A patient is exposed to a cold environment. Which physiological response best illustrates homeostasis?

Accepted Answer

Shivering to generate heat

Question 6

Which of the following best describes the function of voltage-gated sodium channels during the action potential?

Accepted Answer

They open during depolarization, causing rapid sodium entry.

Question 7

If a cell is placed in a hypertonic solution, what will happen to its volume?

Accepted Answer

It will decrease due to water efflux.

Question 8

Which of the following best explains the difference between facilitated diffusion and active transport?

Accepted Answer

Facilitated diffusion moves substances down their concentration gradient without energy input, while active transport moves substances against their gradient using ATP.

Question 9

Which of the following is a correct statement about the Nernst equation for calculating equilibrium potential?

Accepted Answer

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

Question 10

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

Accepted Answer

Antidiuretic hormone (ADH)

Question 11

Which of the following best describes the process of up-regulation in cellular signaling?

Accepted Answer

Increase in the number of receptors on the cell surface

Question 12

Which of the following is a correct sequence of events in the generation of an action potential?

Accepted Answer

Depolarization → Repolarization → Hyperpolarization

Question 13

Which of the following best describes the effect of a loss of function mutation in the Na+/K+ ATPase pump?

Accepted Answer

Cells will lose potassium and accumulate sodium, disrupting membrane potential.

Question 14

Which of the following is a primary function of the interstitial fluid compartment?

Accepted Answer

Serving as a medium for exchange of nutrients and waste between blood and cells

Question 15

Which of the following best describes the effect of hypokalemia (low plasma potassium) on the resting membrane potential?

Accepted Answer

It makes the resting membrane potential more negative (hyperpolarized).

Question 16

Which of the following is a correct statement about the movement of water across cell membranes?

Accepted Answer

Water moves by osmosis from areas of low solute concentration to high solute concentration.

Question 17

A patient is given an intravenous solution of 0.9% NaCl. What type of solution is this relative to plasma?

Accepted Answer

Isotonic

Question 18

Which of the following best describes the role of calcium ions ($$	ext{Ca}^{2+}) in $$cellular signaling?

Accepted Answer

They act as secondary messengers, triggering various cellular responses.

Question 19

Which of the following is the correct order of events in a negative feedback loop regulating blood glucose?

Accepted Answer

Sensor detects high glucose → Control center releases insulin → Effector cells uptake glucose → Blood glucose decreases

Anatomy & Physiology I: Course Structure, Learning Outcomes, and Key Concepts

Guida di studio - Domande di pratica

Study guide - Flashcard