Cardiac Regulation

Q.

Which hormone is secreted by adrenal medulla?

Q.

What are the functions of the cardiac conduction system?

Q.

Write briefly about the endocrine gland which prepares the body for emergencies.

Q. Which of the following is associated with decrease in cardiac output?

1. Adrenal medullary hormones
2. Pneumotaxic centre
3. Parasympathetic neural signals
4. Sympathetic nerves

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. Adrenal medullary hormones _______________ the heart rate.

1. increase
2. decrease
3. stabilize
4. has no impact on

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. Statement 1: Parasympathetic neural system increases the rate of heart beat.
Statement 2: Sympathetic neural system decreases the rate of heart beat.

1. Both the statements are correct
2. Both the statements are incorrect
3. Statement 1 is true but statement 2 is false
4. Statement 2 is true but statement 1 is false

Q.

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

1. Somatic

2. Parasympathetic

3. Sympathetic

4. Autonomic