Biology · General Awareness
Human Circulatory System
846 Questions
The human circulatory system explores the network of blood vessels, heart valves, and structural pathways. Test items often target blood flow sequences and specific vascular functions. Mastering these details is vital for biology preparation.
Heart valves and chambersBlood vessels and venulesArteries of the bodyBlood supply to organsCentral nervous system supply
Human Circulatory System Questions
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Hepatic portal vein
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Lymphatic vessels
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Common bile duct
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Inferior vena cava
D
Correct answer
Explanation
Inferior vena cava is not a component of portal triad.
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The heart regulates the amount of vasodilation or vasoconstriction of the coronary arteries.
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During the ventricular systole, the subendocardial coronary vessels are compressed due to the high intra-artirial pressures.
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If the posterior descending artery is supplied by the circumflex artery (CX), then the coronary circulation is termed as left-dominant.
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The papillary muscles are attached with the mitral valve.
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The majority of vasculature in the body constricts to norepinephrine.
B
Correct answer
Explanation
Correct Answer: During the ventricular systole, the subendocardial coronary vessels are compressed due to high intra-arterial pressure.
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Paracrines
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Local chemical factors
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Non-adgregenic, non-cholinergic autonomic nerves
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Renal hormones
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Epinephrine
D
Correct answer
Explanation
Two kidney hormones, angiotensin II and vasopressin, are powerful vasoconstrictors.
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Because they are readily soluble in water
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Because they have low molecular weight
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Because they are non-antigenic
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Because they are organic catalysts
B
Correct answer
Explanation
Being a low molecular weight substance, hormones can easily pass through the capillary wall.
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upper parts of the body to the heart
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lower parts of the body to the heart
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the heart to lateral parts of the body
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lateral parts of the body to the heart
A
Correct answer
Explanation
Inferior vena cava brings blood from lower half of the body.
Superior vena cava brings blood from upper half of the body.
Both of these large veins join at the right atrium of the heart.
Thus, (2) is incorrect and (1) is correct.
Match the following:
| |
|
| a. Left ventricle |
1. a heart chamber responsible for pumping deoxygenated blood to the lungs |
| b. Right ventricle |
2. a heart chamber responsible for collecting deoxygenated blood from the bloodstream |
| c. Left auricle |
3. a heart chamber responsible for pumping oxygenated blood to tissues all over the body |
| d. Right auricle |
4. a heart chamber responsible for collecting oxygenated blood as it leaves the lungs |
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a - 2, b - 1, c - 4, d - 3
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a - 1, b - 3, c - 4, d - 2
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a - 3, b - 1, c - 2, d - 4
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a - 3, b - 1, c - 4, d - 2
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a - 3, b - 4, c - 1, d - 2
D
Correct answer
Explanation
This is the correct option. The left ventricle is a heart chamber responsible for pumping oxygenated blood to tissues all over the body. The right ventricle is a heart chamber responsible for pumping deoxygenated blood to the lungs. The left auricle is a heart chamber responsible for collecting oxygenated blood as it leaves the lungs. The right auricle is a heart chamber responsible for collecting deoxygenated blood from the bloodstream.
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Mitral valve
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Bileaflet valve
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Tricuspid valve
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Aortic valve
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Pulmonary valve
B
Correct answer
Explanation
Yes, it is the correct answer. It is not a natural valve present in the heart but an artificial mechanical valve used by a doctor for a cardio patient.
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Kawasaki disease
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Lyme disease
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relapsing fever
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yaws
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syphilis
A
Correct answer
Explanation
Kawasaki disease is an acute febrile illness with inflammation of small and medium sized blood vessels throughout the body, in particular the coronary arteries (blood vessels around the heart).
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Hepatic vein
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Hepatic artery
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Renal artery
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Renal vein
C
Correct answer
Explanation
One quarter of the total blood output from the heart comes to the kidneys along the renal artery. Two renal arteries arise from the abdominal section of the aorta, each artery supplies a lobe of the kidney. The incoming artery divides into four or five branches, eventually forming arterioles, each of which leads to the compact ball of capillaries, called the glomerulus.
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Kidney to heart
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Heart to lungs
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Heart to kidney
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Lungs to heart
D
Correct answer
Explanation
All veins except the pulmonary vein carry deoxygenated blood. The pulmonary vein carries oxygenated blood from lungs to the heart and then supplies it to all body parts.
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Gastrovascular cavity
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Lymphatic cavity
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Nasal cavity
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Chest cavity
D
Correct answer
Explanation
Heart is located in the chest region and the cavity is known as chest cavity. The lower tip of the heart lies slightly tilted towards the left.
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The vein
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The arteriole
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The artery
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The capillary
C
Correct answer
Explanation
Since the blood emerges from the heart at a very high pressure, the arteries have thick, elastic walls. So, option 3 is correct.
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black root rot
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chlorosis
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gray mould
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spotted wilt
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necrosis
E
Correct answer
Explanation
It is the death of most of the cells in an organ or tissue due to disease, injury or failure of blood supply.
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Longitudinal vessel
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Dorsal vessel
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Sub-neural vessel
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Lateral vessel
B
Correct answer
Explanation
The dorsal vessel is involved in forward movement of blood in an earthworm.
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An organ's metabolic requirements are proportional to the number of blood vessels in it.
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Double circulation takes place through a two-chambered heart.
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Haemoglobin in a metamorphosed amphibian has a lower affinity for oxygen.
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Because of lack of an extensive system of blood vessels, open systems require less energy to build and maintain.
B
Correct answer
Explanation
This is incorrect. Fishes have a two-chambered heart and only single circulation is seen in them. Double circulation means that blood passes through the heart twice during each cycle of the circulatory process. In animals that have double circulation (blood circulation) systems, the heart has more than two chambers.