Body Fluids and Circulation Chapter-Wise Test 11

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about cardiac muscle is incorrect?

It is striated like skeletal muscle.
It contracts involuntarily.
It does not require oxygen for contraction.
It has intercalated discs for synchronized contraction.
3

Cardiac muscle requires a continuous oxygen supply for contraction.

Which of the following is correct about the pericardium?

It is a muscular layer of the heart.
It generates electrical impulses for contraction.
It reduces friction between the heart and surrounding tissues.
It pumps blood into the aorta.
3

The pericardium is a protective membrane filled with fluid that reduces friction during heartbeats.

Which chamber of the heart pumps deoxygenated blood into the pulmonary circulation?

Left atrium
Right atrium
Left ventricle
Right ventricle
4

The right ventricle pumps deoxygenated blood into the pulmonary artery, which carries it to the lungs for oxygenation.

Which of the following is incorrect regarding blood flow through the heart?

The right ventricle pumps blood to the pulmonary artery.
The left atrium receives oxygenated blood from the lungs.
The pulmonary veins carry deoxygenated blood.
The aorta distributes oxygenated blood to body tissues.
3

Pulmonary veins carry oxygenated blood from the lungs to the left atrium, not deoxygenated blood.

Which of the following is correct about the human heart?

The human heart has three chambers.
The human heart is myogenic in nature.
The right side of the heart pumps oxygenated blood.
The left atrium receives deoxygenated blood.
2

The human heart is myogenic, meaning it generates its own electrical impulses.

Which of the following is NOT a function of the circulatory system?

Transporting oxygen
Regulating body temperature
Synthesizing hormones
Distributing nutrients
3

The circulatory system transports hormones but does not synthesize them; hormones are produced by endocrine glands.

Which of the following blood vessels carries the highest concentration of oxygen?

Pulmonary artery
Pulmonary vein
Vena cava
Hepatic portal vein
2

The pulmonary vein carries oxygen-rich blood from the lungs to the left atrium of the heart.

Which of the following is incorrect about leukocytes (WBCs)?

Neutrophils are the first line of defense against infections.
Lymphocytes produce antibodies.
WBCs have a longer lifespan than RBCs.
Basophils release histamine during allergic reactions.
3

Most WBCs have a shorter lifespan than RBCs, except for some memory lymphocytes that persist for years.

Which of the following carries deoxygenated blood?

Pulmonary vein
Pulmonary artery
Aorta
Coronary artery
2

The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs for oxygenation.

Which of the following statements about erythrocytes is incorrect?

They contain hemoglobin for oxygen transport.
They lack a nucleus in mature form.
They are primarily involved in immune response.
They have a lifespan of about 120 days.
3

RBCs primarily transport oxygen, while WBCs are involved in the immune response.

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