Question

lo 1.1. what happens when a hormone reaches its target cell? the target cell immediately dies upon contact with the hormone. the target cell releases its own hormones to counteract the incoming hormone. the hormone has no effect on the target cell and is simply eliminated from the body. it binds to specific receptors on the cells surface, triggering a response within the cell. it is broken down by enzymes in the bloodstream before it can reach the target cell.

Explanation:

Hormones are chemical messengers. When a hormone reaches its target cell, it binds to specific receptors (either on the cell surface for protein - based hormones or inside the cell for lipid - based hormones). This binding triggers a series of intracellular events (signal transduction pathways) that lead to a cellular response.

• The first option is incorrect because hormones do not cause the target cell to die upon contact. Hormones are meant to regulate cell function, not kill the cell.
• The second option is wrong. Target cells do not release hormones to counteract the incoming hormone. Hormone release is typically regulated by endocrine glands in response to specific stimuli (like negative feedback mechanisms), not as a direct response to an incoming hormone at the target cell level.
• The third option is incorrect. If a hormone has reached its target cell, it is because it is supposed to have an effect on that cell. Hormones that are not needed are eliminated, but not at the target - cell stage in the way described.
• The fifth option is wrong. If the hormone is broken down before reaching the target cell, it would not reach the target cell in the first place. The question assumes the hormone has reached the target cell.

Answer:

It binds to specific receptors on the cell's surface, triggering a response within the cell.