Which organ secretes insulin and how is it transported?
▶️ Answer/Explanation
Ans: C
Insulin is secreted by the pancreas (C), specifically by the β-cells in the islets of Langerhans. It is transported via the bloodstream (endocrine system) to target cells, such as liver and muscle cells, to regulate blood glucose levels.
Options A and B are incorrect as they represent other organs (e.g., liver or adrenal glands), while D incorrectly suggests neural transport. Thus, the correct answer is C (Pancreas → Blood).
Which statements describe adrenaline and its effects on the human body?
1 Pupil diameter becomes smaller.
2 Breathing rate decreases.
3 Heart rate increases.
4 Adrenaline is transported in the blood.
▶️ Answer/Explanation
Ans: D
Adrenaline triggers the “fight or flight” response, causing:
- Pupil dilation (not constriction – statement 1 is wrong)
- Increased breathing rate (not decreased – statement 2 is wrong)
- Increased heart rate (statement 3 is correct)
- Transport via bloodstream (statement 4 is correct)
Only statements 3 and 4 are accurate, making D the correct choice.