Question

by sending signals that stimulate the release of hormones, the human brain controls the cycle of digestion, including the process of nutrient absorption. the brain initiates the release of these hormones at certain times of the day, based on daily rhythms. hormones then stimulate nutrient absorption.
part a:
based on this information, which body system is most directly regulating the digestive system?
○ respiratory
○ excretory
○ nervous
○ endocrine
part b:
which statement best supports the answer to part a?
○ intake of oxygen is reduced so that nutrients can be more readily absorbed.
○ glands release chemicals into the blood, leading to the increased absorption of nutrients.
○ muscle contractions are increased, reducing water in the body to improve the absorption of nutrients.
○ pores open in the skin so that excess water can be released, making room for the increased absorption of nutrients.

Explanation:

Part A: The question describes the brain sending signals to trigger hormone release for digestive regulation. The nervous system controls such signaling, while the endocrine system manages hormones, but the direct regulatory system here (sending signals to initiate hormone release) is the nervous system.
Part B: To support the nervous system's role in digestive regulation, the statement must link nervous signaling to hormonal/chemical release for nutrient absorption, which matches the option about glands releasing chemicals into blood to boost nutrient absorption.

Answer:

Part A: Nervous
Part B: Glands release chemicals into the blood, leading to the increased absorption of nutrients.