Q: Which equation best represents the relationship for passive diffusion across a membrane?

$$J = -P \times (C_1$ - C_2$)$$

Question 1

Which of the following best describes the law of mass balance as it applies to body fluid compartments?

Accepted Answer

The total amount of a substance in the body remains constant unless it is added or removed.

Question 2

Which of the following is a key feature of negative feedback control systems in physiology?

Accepted Answer

They maintain homeostasis by counteracting changes from a set point.

Question 3

A cell is placed in a solution containing a high concentration of Na	extsuperscript{+} ions. Which type of membrane protein is primarily responsible for moving Na	extsuperscript{+} against its concentration gradient?

Accepted Answer

Carrier protein utilizing ATP (active transport)

Question 4

Which equation best represents the relationship for passive diffusion across a membrane?

Accepted Answer

$$J = -P 	imes (C_1$ - C_2$)$$

Question 5

Which of the following is TRUE regarding peptide hormones?

Accepted Answer

They bind to surface membrane receptors and initiate signal transduction.

Question 6

The sodium-potassium pump (Na	extsuperscript{+}-K	extsuperscript{+} ATPase) is an example of:

Accepted Answer

Primary active transport

Question 7

Which of the following hormones is derived from tyrosine?

Accepted Answer

Adrenaline (epinephrine)

Question 8

A patient has a deficiency in carrier proteins for glucose in the intestinal epithelium. Which process would be most affected?

Accepted Answer

Facilitated diffusion of glucose

Question 9

Which of the following best explains why steroid hormones have longer half-lives than peptide hormones?

Accepted Answer

Steroid hormones bind to carrier proteins in the blood, protecting them from rapid degradation.

Question 10

Which of the following is a correct sequence in the renin-angiotensin system?

Accepted Answer

Renin converts angiotensinogen to angiotensin I, which is then converted to angiotensin II.

Question 11

Which of the following is a function of membrane receptor proteins?

Accepted Answer

Facilitating cell-to-cell communication via signal transduction

Question 12

A hormone binds to a G protein-coupled receptor (GPCR) and activates adenylyl cyclase. What is the immediate result?

Accepted Answer

Increase in intracellular cAMP concentration

Question 13

Which of the following is a distinguishing feature of amine hormones compared to peptide and steroid hormones?

Accepted Answer

They are synthesized from amino acids such as tryptophan and tyrosine.

Question 14

Which of the following best describes the role of tropic hormones in the hypothalamic-anterior pituitary pathway?

Accepted Answer

They stimulate the release of hormones from other endocrine glands.

Question 15

A researcher removes a suspected endocrine gland from an animal and observes a loss of a specific physiological function. What is the next step to confirm the gland's role?

Accepted Answer

Replace the hormone and observe restoration of function.

Question 16

Which of the following is an example of secondary active transport?

Accepted Answer

Sodium-glucose cotransport

Question 17

Which of the following statements about signal amplification in cell signaling is correct?

Accepted Answer

A single hormone molecule can trigger the production of many second messenger molecules.

Question 18

Which of the following is a correct statement about the difference between agonists and antagonists?

Accepted Answer

Agonists activate receptors to produce a response, while antagonists block receptor activation.

Question 19

Which of the following is a direct effect of steroid hormones binding to their intracellular receptors?

Accepted Answer

Activation or repression of gene transcription for protein synthesis

Question 20

Which of the following best explains why the body compartments are in a state of chemical disequilibrium?

Accepted Answer

Selective permeability of cell membranes allows different concentrations of ions in each compartment.

Physiology as an Integrated Science: Endocrine Systems and Cellular Transport

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