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  4. The events in the mechanism of protein hormones are listed below. Arrange them in correct sequence. I. Hormone binds to receptor on plasma membrane. II. Physiological responses. III. Biochemical responses. IV. Generation of secondary messenger Choose the correct option.

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Q. The events in the mechanism of protein hormones are listed below. Arrange them in correct sequence.
I. Hormone binds to receptor on plasma membrane.
II. Physiological responses.
III. Biochemical responses.
IV. Generation of secondary messenger
Choose the correct option.

Chemical Coordination and Integration

Solution:

Option (c) depicts the correct sequence of events. The events in sequence describing the mechanism of action of protein hormones are as follows
• Hormone binds to receptor on plasma membrane.
• Response-$I$ (given by receptor) generation of secondary messenger (cyclic AMP or $Ca^{2+}$).
• Biochemical responses.
• Physiological responses, e.g. ovarian growth, etc.