Question

Adrenaline directly affects

• A. β-cells of Langerhans
• B. Epithelial cells of the stomach
• C. Sinoatrial Node (SA node)
• D. Dorsal root of spinal cord

Answer 1

The correct option is C

Sinoatrial Node (SA node)

The correct option is (c):

Explanation of the correct option:

Adrenaline:

1. It is a hormone secreted by the adrenal gland.
2. It affects the SA node, thus changing the pace of heartbeat.
3. It is also known as emergency hormone, since it increases the heart rate during emergency situations.

Explanation of the incorrect options:

Option A:

1. β-cells of Langerhans secrete insulin hormone.

Option B:

1. Epithelial cells of the stomach protects the lining of stomach from infectious agents and gastric juices.

Option D:

1. Dorsal root of spinal cord transmit sensory information to the CNS.

Final answer: Adrenaline directly affects Sinoatrial Node (SA node).