Cardiac Regulation

Q.

The (i)___, controls both the heart rate and the stroke volume. There are two separate nerves from the cardiovascular centre to the sinoatrial node: the (ii)___, to speed up the heart rate and the (iii)___, to slow it down. (i) receives information from special cells called (iv)___, present in the aortic arch and in the carotid sinus.

1. (i) Cardiac centre, (ii) Parasympathetic system, (iii) Sympathetic system, (iv) Baroreceptors

2. (i) Cardiac centre, (ii) Sympathetic system, (iii) Parasympathetic system, (iv) Baroreceptors

3. (i) Sympathetic system, (ii) Baroreceptors, (iii) Cardiac centre, (iv) Parasympathetic system

4. (i) Baroreceptors, (ii) Sympathetic system, (iii) Parasympathetic system, (iv) Cardiac centre

Q.

If a person is suffering from blood loss, the cardiac output will __(i)____ , blood vessels will _(ii)_____ and the heartbeat will be ___(iii)____.

1. (i) increase, (ii) constrict, (iii)increased

2. (i) decrease, (ii)constrict, (iii) increased

3. (i) increase, (ii) dilate, (iii) decreased

4. (i) decrease, (ii)dilate, (iii) increased

Q.

Which of the following nerves causes the adrenal medulla to release epinephrine and norepinephrine and also speed up body activities?

1. Parasympathetic

2. Sympathetic

3. Somatic

4. Autonomic

Q.

Go through the following statements: (i) The stroke volume multiplied by heart rate gives the cardiac output. (ii) The second heart sound is associated with the closure of semilunar valves. (iii) Heart failure is the same as cardiac arrest or a heart attack. Which of these are correct?

1. (i) & (ii)

2. (ii) & (iii)

3. (i) & (iii)

4. All are correct

Q.

If the blood pressure is too low, the cardiovascular control centre in the medulla oblongata attempts to compensate by causing a/an _______.

1. Decreased cardiac output

2. Increased contractility of the myocardial cells

3. Systemic arteriolar dilation

4. Decreased heart rate

Q.

Which of the following is NOT correctly matched?

1. Cardiac centres - Cardiovagal and Vasomotor

2. Baroreceptors - Present in aorta and carotid

3. Positive Inotropic action - Increases the firing rate of Sinoatrial node

4. Negative Chronotropic effect - Increases the force of contraction of heart

Q. Which signals will get disrupted in case of a spinal cord injury?

Q. explain flow of bood in heart with diagram

Q. The adrenal glands release the hormone that regulates in our body.