Question 1

Which of the following best describes the difference between water-soluble and lipid-soluble hormones in terms of their mechanism of action?

Accepted Answer

Water-soluble hormones bind to cell surface receptors and activate second messenger systems, while lipid-soluble hormones diffuse through the cell membrane and bind to intracellular receptors.

Question 2

A patient has a tumor in the anterior pituitary gland that causes excessive secretion of growth hormone (GH). Which of the following symptoms is most likely to develop in an adult?

Accepted Answer

Acromegaly

Question 3

Which equation correctly represents the calculation of cardiac output ($$CO) in $$terms of heart rate ($$HR) $$and stroke volume ($$SV$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 4

Which of the following is a function of alpha cells in the pancreatic islets?

Accepted Answer

Secretion of glucagon to raise blood glucose levels

Question 5

A patient is given a blood transfusion and develops agglutination. Which of the following is the most likely cause?

Accepted Answer

The recipient's plasma contained antibodies against the donor's antigens.

Question 6

Which of the following best describes the role of the hypothalamus in hormone regulation?

Accepted Answer

It produces releasing and inhibiting hormones that control the secretion of hormones from the anterior pituitary.

Question 7

Which of the following is the correct sequence of events in the cardiac conduction system?

Accepted Answer

SA node → AV node → Bundle of His → Purkinje fibers

Question 8

Which of the following best explains why erythrocytes (red blood cells) are technically not true cells?

Accepted Answer

They lack a nucleus and most organelles.

Question 9

A patient with Addison's disease has decreased secretion of cortisol. Which of the following symptoms would most likely be observed?

Accepted Answer

Hypoglycemia and hypotension

Question 10

Which of the following is the main function of hemoglobin in erythrocytes?

Accepted Answer

Transporting oxygen from lungs to tissues

Question 11

Which of the following best describes the effect of parathyroid hormone (PTH) on blood calcium levels?

Accepted Answer

PTH increases blood calcium by stimulating bone resorption and increasing calcium reabsorption in the kidneys.

Question 12

Which of the following is a correct statement about the phases of the cardiac cycle?

Accepted Answer

Ventricular diastole allows the ventricles to fill with blood from the atria.

Question 13

Which of the following equations correctly represents the relationship between blood pressure ($$BP$$), cardiac output ($$CO$$), and total peripheral resistance ($$TPR$$)?

Accepted Answer

$$BP = CO 	imes TPR$$

Question 14

A patient is found to have a deficiency in antidiuretic hormone (ADH). Which of the following symptoms would most likely be present?

Accepted Answer

Increased urine output and dehydration

Question 15

Which of the following is the correct order of layers in the heart wall from outermost to innermost?

Accepted Answer

Epicardium → Myocardium → Endocardium

Question 16

Which of the following best describes the role of the SA node in the heart?

Accepted Answer

It acts as the heart's pacemaker, initiating the electrical impulse for each heartbeat.

Question 17

Which of the following hormones is produced by the adrenal medulla and is responsible for the 'fight or flight' response?

Accepted Answer

Epinephrine

Question 18

A patient with type 1 diabetes mellitus is unable to produce insulin. Which of the following best explains the effect on blood glucose levels?

Accepted Answer

Blood glucose levels increase due to decreased cellular uptake of glucose.

Question 19

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

Accepted Answer

Initiating blood clot formation

Anatomy & Physiology Study Notes: Endocrine System, Blood, and Cardiovascular System (Heart)

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