Q: Which equation best represents the relationship between blood pressure, osmotic pressure, and net fluid movement in capillaries?

$$\text{Net fluid movement} = \text{Blood pressure} - \text{Osmotic pressure}$$

Question 1

Which of the following best describes the main advantage of a closed double circulatory system in mammals compared to a single circulatory system in fish?

Accepted Answer

It enables oxygen-rich blood to reach important organs quickly and at high pressure.

Question 2

During the cardiac cycle, which phase is responsible for the filling of the heart chambers?

Accepted Answer

Diastole

Question 3

Which structure in the heart acts as the primary pacemaker, setting the rate for contraction?

Accepted Answer

Sinoatrial (SA) node

Question 4

A patient is diagnosed with tachycardia, a condition where the heartbeat is too fast. Which treatment option directly targets the electrical conduction system of the heart?

Accepted Answer

Ablation

Question 5

Which of the following statements about cardiac muscle is correct?

Accepted Answer

Cardiac muscle cells are connected via intercalated discs, allowing fast communication.

Question 6

Which blood vessel type is characterized by thin walls and slow blood flow, facilitating exchange of substances between blood and tissues?

Accepted Answer

Capillaries

Question 7

What is the primary function of the lymphatic system in relation to the circulatory system?

Accepted Answer

Return lost fluid and proteins from tissues back to the blood

Question 8

Which of the following best explains why blood flow velocity is lowest in capillaries?

Accepted Answer

The total cross-sectional area of capillaries is greatest, causing blood to flow slowly.

Question 9

A blood sample is allowed to clot and the fluid portion is separated. What is this fluid called?

Accepted Answer

Serum

Question 10

Which cellular element of blood is primarily responsible for transporting oxygen?

Accepted Answer

Erythrocytes

Question 11

Which equation best represents the relationship between blood pressure, osmotic pressure, and net fluid movement in capillaries?

Accepted Answer

$$	ext{Net fluid movement} = 	ext{Blood pressure} - 	ext{Osmotic pressure}$$

Question 12

Which of the following is NOT a function of plasma proteins?

Accepted Answer

Transporting oxygen

Question 13

A patient has a blockage in the pulmonary artery. Which part of the circulatory system will be directly affected?

Accepted Answer

Pulmonary circulation

Question 14

Which of the following best describes the role of valves in veins?

Accepted Answer

They prevent backflow of blood.

Question 15

Which of the following is a correct sequence of blood flow through the heart?

Accepted Answer

Vena cava → right atrium → right ventricle → pulmonary artery

Question 16

Which of the following is a real-life consequence of a malfunctioning AV node in the heart?

Accepted Answer

The ventricles contract out of sync with the atria, leading to arrhythmia.

Question 17

Which blood vessel has the highest blood pressure and why?

Accepted Answer

Aorta, because it receives blood directly from the left ventricle during systole.

Question 18

Which of the following is a function of thrombocytes (platelets)?

Accepted Answer

Initiating blood clotting by forming a platelet plug and releasing clotting factors.

Question 19

Which of the following best describes the composition of blood?

Accepted Answer

Plasma (55%) and cellular elements (45%)

Question 20

Which of the following is a consequence of decreased plasma protein concentration in blood?

Accepted Answer

Reduced osmotic pressure, leading to increased fluid loss from capillaries to tissues

LESSON 6 Blood and Circulation: Structure, Function, and Regulation

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