Valves

Q.

Explain the schematic sectional view of the human heart.

Q. prevents back flow of blood from left ventricle to left atrium.

1. Tricuspid valve
2. Bicuspid valve
3. Semilunar valve

Q.

Chordae tendinae are found in ___.

1. Joints of legs

2. Atria of heart

3. Ventricles of heart

4. Ventricles of brain

Q.

The opening between left auricle and left ventricle is guarded by________

1. Bicuspid valve

2. Tricuspid valve

3. Aortic semilunar valve

4. Pulmonary semilunar valve

Q.

Chordae tendineae are the tendons that connect______with the cardiac muscles.

1. The pulmonary valves are supported by chordae tendineae so that the regurgitation of blood into the atria during ventricular contraction does not occur

2. The tricuspid valve divides the right atrium from the right ventricle

3. Aortic and pulmonary valves control the flow of blood into the heart

4. The mitral valve separates the left atrium from the left ventricle

Q.

Left ___ of heart pumps blood to all parts of the body?

Q.

(i) The process of removal of waste products formed by metabolic activities is called _______

Q. Name the organ that comes into existence due to enlargement of larynx ?

Q.

Lub-dub sound is due to

1. the valves opening and closing

2. the movement of lungs

3. the contraction of heart alone

4. the rhythmic movement of blood

Q.

The valve which is present between the right auricle and right ventricle is________

1. Aortic semilunar valve

2. Pulmonary semilunar valve

3. Bicuspid valve

4. Tricuspid valve

Q.

Name the valves present in the heart.

Q. The bicuspid valve is also called as ___

Q.

Give scientific reasons for the following statements:

The left ventricle of the heart has a thicker wall than the right ventricle.

Q.

___ are present to prevent backflow of blood in the heart.

Q.

________ are present to prevent backflow of blood in the heart.

1. Pacemaker

2. Auricles

3. Ventricles

4. Valves

Q.

Fill in the blank with a suitable term:

Oxygenated blood from the heart is transported by_________(left atrium/left ventricle).

Q.

Ventricles are thick walled as compared to auricles because

1. it has to pump blood to auricles

2. it has to receive blood from auricles

3. it is present in posterior side

4. it has to pump the blood with more force