Q: Which formula is used to calculate cardiac output ($$CO$$), and what does each variable represent?

$$CO = HR \times SV$$, where $$HR is $$heart rate and $$SV is $$stroke volume.

Question 1

Which of the following best describes the difference between direct gene activation and second messenger systems in hormone action?

Accepted Answer

Direct gene activation involves hormones entering the cell and binding to intracellular receptors to affect gene transcription, while second messenger systems involve hormones binding to membrane receptors and triggering intracellular signaling cascades.

Question 2

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

Accepted Answer

Excessive urination and dehydration

Question 3

Which of the following is NOT a function of blood?

Accepted Answer

Producing hormones for endocrine signaling

Question 4

A patient’s blood type is AB-. Which antigens are present on their red blood cells, and which antibodies are present in their plasma?

Accepted Answer

A and B antigens; anti-Rh antibodies

Question 5

Which phase of hemostasis involves the conversion of fibrinogen to fibrin, forming a mesh that stabilizes the platelet plug?

Accepted Answer

Coagulation

Question 6

A newborn develops hemolytic disease due to Rh incompatibility. Which factor is responsible for this condition?

Accepted Answer

Mother is Rh negative and baby is Rh positive; mother has developed anti-Rh antibodies

Question 7

Which layer of the heart is responsible for the contraction that pumps blood?

Accepted Answer

Myocardium

Question 8

During ventricular systole, which of the following events occurs?

Accepted Answer

Ventricles contract and semilunar valves open

Question 9

Which formula is used to calculate cardiac output ($$CO$$), and what does each variable represent?

Accepted Answer

$$CO = HR 	imes SV$$, where $$HR is $$heart rate and $$SV is $$stroke volume.

Question 10

A patient’s blood pressure is measured as 120/80 mmHg. What do these numbers represent?

Accepted Answer

120 is the systolic pressure, 80 is the diastolic pressure

Question 11

Which of the following best explains why taking a pulse at the wrist (radial artery) is commonly used in clinical practice?

Accepted Answer

The radial artery is superficial and easily compressed against bone

Question 12

Which of the following would most likely increase both heart rate and blood pressure simultaneously?

Accepted Answer

Release of epinephrine during a 'fight or flight' response

Question 13

A patient is experiencing bradycardia. Which part of the heart’s conduction system is most likely malfunctioning?

Accepted Answer

Sinoatrial (SA) node

Question 14

Which of the following statements about the endocrine system is correct?

Accepted Answer

Hormones are released directly into the bloodstream and affect distant target cells.

Question 15

Which hormone is primarily responsible for lowering blood glucose levels after a meal?

Accepted Answer

Insulin

Question 16

A patient with anemia has a reduced number of red blood cells. Which of the following is a likely consequence?

Accepted Answer

Decreased oxygen delivery to tissues

Question 17

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 18

Which of the following best describes the role of platelets in hemostasis?

Accepted Answer

Platelets form a temporary plug at the site of vessel injury

Question 19

A patient is given a medication that blocks beta-adrenergic receptors. What effect would this most likely have on the cardiovascular system?

Accepted Answer

Decrease heart rate and blood pressure

Question 20

Which of the following is a common misconception about blood pressure measurement?

Accepted Answer

Blood pressure readings are always the same in both arms.

BION 204 Exam 3 Study Guide: Endocrine, Blood, and Cardiovascular Systems

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