Question

1. which of the following scenarios exemplifies a negative feedback loop? a. blood clotting after a cut b. uterine contractions during labor c. a nerve impulse traveling down a neuron d. insulin release to lower blood sugar levels

Explanation:

Negative feedback loops work to maintain homeostasis by counter - acting changes. Insulin release to lower blood sugar levels is a classic example. When blood sugar rises, insulin is released to bring it back down. Uterine contractions during labor are a positive feedback loop as they intensify the process. A nerve impulse traveling down a neuron is a normal neural function, not a feedback loop. Blood clotting after a cut is a positive feedback loop as it leads to more clotting.

Answer:

d. Insulin release to lower blood sugar levels