Question

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

• A. Adrenal medullary hormones
• B. Pneumotaxic centre
• C. Parasympathetic neural signals
• D. Sympathetic nerves

Answer 1

The correct option is C Parasympathetic neural signals

Cardiac output (CO) is the amount of blood pumped by the heart in one minute.

The cardiac output is regulated by the autonomic nervous system.

Autonomic nervous system has two main divisions which are sympathetic and parasympathetic nervous systems.

Neural signals through sympathetic nerves increase the cardiac output.

The parasympathetic neural signals decrease the cardiac output.

Adrenal medullary hormones are produced by the adrenal glands. These hormones increase the cardiac output.

Hence, option b is correct.

Pneumotaxic centre in the pons region of the brain can reduce the duration of inspiration and alter the respiratory rate.