Q: Which of the following equations correctly represents the normal pH range of blood?

$$7.35 \leq \text{pH} \leq 7.45$$

Question 1

Which layer of the heart wall is continuous with the endothelium of blood vessels and forms the inner surface of the heart and all blood vessels?

Accepted Answer

Endocardium

Question 2

A patient presents with a hole in the interatrial septum due to incomplete closure of the foramen ovale. What is the most likely diagnosis?

Accepted Answer

Arterial septal defect

Question 3

Which of the following correctly describes the function of the ductus arteriosus in fetal circulation?

Accepted Answer

Allows blood to bypass the fetal lungs by connecting the pulmonary trunk to the aorta

Question 4

Which of the following is the most abundant plasma protein and is responsible for maintaining osmotic pressure in the blood?

Accepted Answer

Albumin

Question 5

A blood vessel is observed to have a thick tunica media with a lot of smooth muscle and is responsible for distributing blood to various organs. What type of vessel is this?

Accepted Answer

Muscular artery

Question 6

Which of the following statements about red blood cells (erythrocytes) is TRUE?

Accepted Answer

They are biconcave discs to maximize surface area for gas exchange

Question 7

Which structure in the heart prevents simultaneous contraction of the atria and ventricles by providing electrical insulation?

Accepted Answer

Cardiac skeleton (fibrous skeleton)

Question 8

During the cardiac cycle, which valve prevents backflow of blood from the right ventricle to the right atrium?

Accepted Answer

Tricuspid valve

Question 9

Which of the following is TRUE regarding the conduction system cells of the heart?

Accepted Answer

They are modified cardiac muscle cells that produce and conduct electrical impulses

Question 10

Which of the following is the correct path of blood flow in the adult pulmonary circulation?

Accepted Answer

Right ventricle → pulmonary arteries → lungs → pulmonary veins → left atrium

Question 11

Which of the following blood vessel layers is composed of simple squamous epithelium and is continuous with the endocardium?

Accepted Answer

Tunica intima

Question 12

A patient has a build-up of fat deposits in the tunica intima of an artery, leading to narrowing and blockage. What is this condition called?

Accepted Answer

Atherosclerosis

Question 13

Which of the following is NOT a function of blood in the cardiovascular system?

Accepted Answer

Production of electrical impulses

Question 14

Which of the following is TRUE about hemocytoblast cells?

Accepted Answer

They are stem cells that give rise to all blood cells in the bone marrow

Question 15

Which of the following equations correctly represents the normal pH range of blood?

Accepted Answer

$$7.35 \leq 	ext{pH} \leq 7.45$$

Question 16

If a patient has a hematocrit of 45%, what does this indicate?

Accepted Answer

45% of their blood volume is made up of red blood cells

Question 17

Which of the following is a function of the chordae tendineae in the heart?

Accepted Answer

Prevent backflow of blood into the atria during ventricular contraction

Question 18

Which of the following statements about capillaries is TRUE?

Accepted Answer

They allow exchange of gases and nutrients between blood and interstitial fluid

Question 19

Which of the following is the correct sequence of structures that electrical signals travel through in the heart's conduction system?

Accepted Answer

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

Question 20

Which of the following is a granulocyte that attacks blood parasites and is involved in allergic responses?

Accepted Answer

Eosinophil

Cardiovascular System: Structure, Function, and Blood Composition

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