Question

Neurogenic heart receives stimulus for contraction from ______________ fibres.

• A. elastin
• B. collagen
• C. nerve
• D. muscle

Hint:

Neurogenic heart = nerve-controlled heartbeat; Myogenic heart = muscle-controlled heartbeat.

Answer 1

The Correct Option is C

Step 1: Understanding neurogenic heart.
A neurogenic heart is one in which the heartbeat is initiated and controlled by nervous impulses rather than originating within the heart muscle itself.
Step 2: Source of contraction stimulus.
In neurogenic hearts, contraction begins only when a nerve impulse reaches the cardiac muscle. This type of heart is commonly seen in arthropods like insects.
Step 3: Elimination of incorrect options.
Elastin and collagen are structural proteins and do not generate impulses.
Muscle fibres contract but do not initiate impulses in neurogenic hearts.
Step 4: Conclusion.
The stimulus for contraction in a neurogenic heart comes from nerve fibres.