Question

Cardiac activities of the heart are regulated by ______.

1. Nodal tissue
2. A special neural centre in the medulla oblongata
3. Adrenal medullary hormones
4. Adrenal cortical hormones

Choose the correct answer from the options given below:

Options

• A, B and C only

• A, B, C and D

• A, C and D only

• A, B and D only

Answer 1

Cardiac activities of the heart are regulated by nodal tissue, a special neural centre in the medulla oblongata, and Adrenal medullary hormones.

Explanation:

1. Nodal tissue: Includes the SA node and AV node, responsible for generating and conducting impulses to regulate the heartbeat.
2. A special neural centre in the medulla oblongata: The medulla controls autonomic regulation of the heart rate through sympathetic and parasympathetic nerves.
3. Adrenal medullary hormones (like adrenaline): This inner part of the adrenal gland releases epinephrine and norepinephrine, which are catecholamines that act on beta-receptors in the heart.