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In which the following can increase the ...

In which the following can increase the rate of heart beat ? (A) Sympathetic neaural signals.
(B) Parasympathetic neural signals
(C ) Adrenal medullary hormones.
(9 ) Vagus nerve
(E ) Thyroxine hormone
(F) Acetylcholine

A

A,C,E

B

D,E,F

C

A,C,D

D

B,D,F

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the following can increase the rate of heartbeat, we will analyze each option provided: 1. **Sympathetic Neural Signals (A)**: - The sympathetic nervous system is responsible for the 'fight or flight' response. It releases neurotransmitters like norepinephrine that increase heart rate by stimulating the heart muscle. - **Conclusion**: Increases heart rate. 2. **Parasympathetic Neural Signals (B)**: - The parasympathetic nervous system, primarily through the vagus nerve, promotes the 'rest and digest' response. It releases acetylcholine, which decreases heart rate. - **Conclusion**: Decreases heart rate. 3. **Adrenal Medullary Hormones (C)**: - The adrenal medulla releases hormones such as adrenaline (epinephrine) during stress, which increases heart rate and prepares the body for action. - **Conclusion**: Increases heart rate. 4. **Vagus Nerve (D)**: - The vagus nerve is part of the parasympathetic nervous system and is known to reduce heart rate when stimulated. - **Conclusion**: Decreases heart rate. 5. **Thyroxine Hormone (E)**: - Thyroxine, produced by the thyroid gland, increases the basal metabolic rate and can lead to an increase in heart rate. - **Conclusion**: Increases heart rate. 6. **Acetylcholine (F)**: - Acetylcholine is a neurotransmitter released by the vagus nerve and is known to decrease heart rate. - **Conclusion**: Decreases heart rate. ### Summary of Findings: - **Options that increase heart rate**: - (A) Sympathetic neural signals - (C) Adrenal medullary hormones - (E) Thyroxine hormone ### Final Answer: The correct options that can increase the heart rate are **A, C, and E**.
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