Question

Which of the following is an incorrect match?
1) Cardiac output - Stroke volume X heart rate.
2) Heart of Frog - Neurogenic.
3) Heart sound Lubb - closure of atrio-ventricular valves.
4) Epinephrine - decreases heart rate.

• A. 1 and 4
• B. 2 and 4
• C. 1 and 3
• D. 1 and 2

Answer 1

Answer: (B)

2 and 4

Cardiac output is the volume of blood pumped by the heart per minute. It is calculated by multiplying Stroke volume with heart rate.

Heart of Frog is myogenic as its rhythmic contraction and relaxation is controlled by specialized muscle cells.

Lubb is the first heart sound and is detected during ventricular contraction when atrio-ventricular valves close.

Epinephrine or adrenaline increases heart rate.

So, the correct answer is '2 and 4'