Adrenaline is a hormone secreted by the adrenal gland in humans under extreme conditions of stress Which of the following statements about adrenaline is incorrect?

Options

A. It increases heart beat.
B. It causes the contraction of diaphragm. .
C. It causes the contraction of muscles around arteries.
D. It increases the flow of blood to the digestive system.

Answer

To determine which statement about adrenaline is incorrect, we need to analyze the effects of adrenaline when it is secreted by the adrenal glands during stress.

### Step-by-Step Solution:

1. **Understanding Adrenaline**: Adrenaline, also known as epinephrine, is a hormone produced by the adrenal medulla. It is released in response to stress and prepares the body for a 'fight or flight' response.

2. **Effects of Adrenaline**: When adrenaline is released, it causes several physiological changes in the body:
- **Increased Heart Rate**: Adrenaline increases the heart rate to pump more blood to vital organs and muscles.
- **Increased Strength of Heart Contraction**: It enhances the strength of the heart's contractions, allowing for more efficient blood circulation.
- **Increased Respiratory Rate**: It stimulates the respiratory system to increase oxygen intake.
- **Blood Flow Redistribution**: Adrenaline redirects blood flow away from non-essential functions, such as digestion, to the muscles and brain.

3. **Analyzing the Statements**: We need to evaluate the statements provided about adrenaline:
- **Statement 1**: Adrenaline increases heart rate. (Correct)
- **Statement 2**: Contraction of diaphragm is responsible for it. (Correct, as increased respiration is stimulated)
- **Statement 3**: Muscles contract around our trachea. (Correct, as it aids in respiration)
- **Statement 4**: It increases the flow of blood to the digestive system. (Incorrect, as adrenaline actually decreases blood flow to the digestive system)

4. **Conclusion**: The incorrect statement about adrenaline is that it increases the flow of blood to the digestive system. In reality, adrenaline diverts blood away from the digestive system to prioritize muscle and brain function during stress.

### Final Answer:
The incorrect statement about adrenaline is: "It increases the flow of blood to the digestive system."

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