Q. No.The normal pacemaker of the human heart is the remnant [derivative] of:
1. chordate tendinae
2. bundle of His
3. conus arteriosus
4. sinus venosus
1. chordate tendinae
2. bundle of His
3. conus arteriosus
4. sinus venosus
The chamber with the thickest musculature in the human heart would be:
| 1. | the right atrium | 2. | the left atrium |
| 3. | the left ventricle | 4. | the right ventricle |
The correct path of circulation of the blood in the human heart is represented by:
| 1. | left atrium, left ventricle, lungs, right atrium, right ventricle, body |
| 2. | right atrium, right ventricle, lungs, left atrium, left ventricle, body |
| 3. | left atrium, left ventricle, right atrium, right ventricle, lungs, body |
| 4. | right atrium, lungs, right ventricle, left atrium, body, left ventricle |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Sympathetic stimulation would lead to:
1. increased heart rate.
2. increased stroke volume.
3. vasoconstriction in visceral blood vessels.
4. all of the above.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
The innermost layer of blood vessel walls made up of one layer of endothelium and in direct contact with the blood is:
| 1. tunica adventitia | 2. tunica intima |
| 3. tunica media | 4. tunica muscularis |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Blood vessels have smooth muscles in their walls that are innervated by:
1. myelinated motor neurons.
2. unmyelinated sympathetic neurons.
3. unmyelinated motor neurons.
4. unmyelinated parasympathetic neurons.
The build-up of fats, cholesterol and other substances in and on the artery walls is known as:
| 1. | arteriosclerosis | 2. | atherosclerosis |
| 3. | aneurysm | 4. | anastomosis |
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
The smoothness of endothelium is a very important factor that prevents thrombus formation. The endothelial cells:
1. increase cardiac output.
2. decrease heart rate.
3. inhibit platelet aggregation and control blood vessel diameter.
4. nourish the cells in the outer half of the blood vessel wall.
Capillary walls are different from the walls of veins and arteries as they are composed of:
1. endothelium only.
2. endothelium and smooth muscle.
3. a tunica interna and a tunica media.
4. smooth muscle and elastic connective tissue.
The right ventricle pumps the blood into the pulmonary trunk that next enters the:
1. pulmonary veins.
2. left and right pulmonary arteries.
3. pulmonary capillaries.
4. left atrium
© 2024 GoodEd Technologies Pvt. Ltd.