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

Multiple choice

In open vascular system the circulating fluid is called

  1. perilymph

  2. lymphatic fluid

  3. haemolymph

  4. blood
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In open circulatory systems (found in arthropods and mollusks), the circulating fluid is haemolymph. It directly bathes the organs and tissues, unlike blood in closed circulatory systems which is confined to vessels.

Multiple choice

Pulmonary vein carries oxygenated blood from

  1. lungs to heart

  2. all body parts

  3. heart to lungs

  4. heart to body parts
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pulmonary veins are unique - they are the only veins that carry oxygenated blood, returning it from the lungs to the left atrium of the heart. All other veins carry deoxygenated blood back to the heart.

Multiple choice

In human beings, the pulmonary artery originates from

  1. limbus of the fossa ovalis

  2. fossa ovalis

  3. crista terminalis

  4. conus arteriosus

  5. septomarginal trabecula
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It is a conical extension of the right ventricle in the heart of mammals, from which the pulmonary artery originates.

Multiple choice

The heart is the pump of the human circulatory system. Which among the following does not characterise the circulation of blood by human heart?

  1. The majority of vasculature in the body constricts to norepinephrine.

  2. The papillary muscles are attached with the mitral valve.

  3. If the posterior descending artery is supplied by the circumflex artery (CX), then the coronary circulation is termed as left-dominant.

  4. During the ventricular systole, the subendocardial coronary vessels are compressed due to the high intra-artirial pressures.

  5. The heart regulates the amount of vasodilation or vasoconstriction of the coronary arteries.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

During contraction of the ventricular myocardium (systole), the subendocardial coronary vessels (the vessels that enter the myocardium) are compressed due to the high intraventricular pressures.

Multiple choice

Which among the following provide(s) blood supply to the penis?

  1. Genitofemoral artery

  2. Internal pudendal arteries

  3. Pampiniform plexus

  4. Femoral artery

  5. Greater palatine artery
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The internal pudendal arteries serve as the penile blood supply by entering the penis dorsally and running deep into the tissues of the corpora cavernosa. The internal pudendal artery becomes the penile artery.

Multiple choice

Endothelium of blood vessels is made up of

  1. simple cuboidal epithelium

  2. simple squamous epithelium

  3. simple columnar epithelium

  4. simple non-ciliated columnar
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The endothelium lining blood vessels consists of simple squamous epithelium. This thin, single-layered tissue facilitates efficient diffusion of gases, nutrients, and waste products between the blood and surrounding tissues. Simple cuboidal epithelium is found in kidney tubules, simple columnar epithelium lines the digestive tract, and ciliated columnar epithelium is found in the respiratory tract.

Multiple choice

Which of the following statements about veins are false? P. Veins are blood vessels that carry blood away from the heart. Q. The venous valves are folds of the tunica intima. R. Most veins carry oxygenated blood. S. Thrombophlebitis is an inflammatory condition of the veins related to blood clots.

  1. P and Q

  2. P and R

  3. P and S

  4. Q and R

  5. R and S
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Veins are elastic blood vessels that transport blood from various regions of the body to the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart.