Circulatory

Heart receives

• Pure Blood

• Venous Blood

• Mixed Blood

• Impure Blood

The duration of cardiac cycle in a normal man is –

• 0.8 seconds

• 80 seconds

• 60 seconds

• 72 seconds

Tags

NGSS.HS-LS1-3

Cardiac output is determined by –

• Heart rate

• Stroke volume

• Blood flow

• Both a and b

Electrocardiogram is a measure of –

• Heart rate

• Ventricular contraction

• Volume of blood pumped

• Electrical activity of heart

Cardiac centre can moderate the cardiac functions through

• Somatic neural system

• Parasympathetic nervous system only

• Autonomic nervous system (ANS)

• Sympathetic nervous system only

Tags

NGSS.HS-LS1-3

A labeled red blood corpuscle is released into the arterial circulation in the left leg. It is recaptured 30 seconds later in the left lung. What is the minimum number of chambers of the heart it must have passed through?

• 0

• 1

• 2

• 3

Lymph (tissue fluid) is composed of

• Plasma

• Large proteins

• Formed elements

• All of them

During the joint diastole heart receive?

• Deoxygenated blood

• Oxygenated blood

• Venous blood

• None

Which of the following statements is incorrect?

• The fibrous cords attached to the flaps of the bicuspid and tricuspid valves are chordae tendinae.

• The opening of inferior vena cava is guarded by Eustachian valve.

• The right atrio-ventricular opening is guarded by the mitral valve

• Impulses received from carotid sinuses decreases heart rate whereas impulses received from vena cava increases heart rate.

The neural center that regulates cardiac activity through ANS is located in:

• Cerebrum

• Hypothalamus

• Pons

• Medulla

Tags

NGSS.HS-LS1-3