Question

name: maybelyn mom - period: date: part 2 - the digestive system & nutrient uptake the digestive system is responsible for breaking down food into smaller molecules that the body can use for energy and growth. specialized cells in the stomach lining secrete enzymes that break down food, while muscle tissues contract to churn food, facilitating nutrient absorption by intestinal cells. nutrients pass into the blood and are carried throughout the body. this coordination allows the digestive system to ensure efficient nutrient uptake. 4. what is the main function of the digestive system? a. break down food and absorb nutrients b. pump oxygen through the body c. control muscle reflexes d. remove extra water from the body 5. which structure is the primary site for absorbing nutrients into the bloodstream? a. stomach b. small intestine c. large intestine d. liver 6. short response: how do both muscle tissues and specialized stomach cells contribute to digestion? part 3 - osmoregulation & feedback loops the body must maintain water and electrolyte balance to stay healthy. the kidneys filter blood, reabsorbing water and essential ions, while removing wastes. when the body is dehydrated, the antidiuretic hormone (adh) is released, signaling the kidneys to conserve water. when the body has too much water, less adh is released, and more water leaves the body as urine. this is an example of a negative feedback loop - the body senses a change and makes adjustments to restore balance. 7. which organ plays the biggest role in keeping water balance in the body? a. heart b. kidneys c. lungs d. stomach

Explanation:

1. The digestive system breaks food into smaller molecules and absorbs nutrients.
2. The small intestine is the main site for nutrient - absorption into the bloodstream.
3. Muscle tissues contract to churn food, and specialized stomach cells secrete enzymes for digestion.
4. The kidneys play the biggest role in maintaining water balance by filtering blood, reabsorbing water and electrolytes, and removing wastes.

Answer:

1. a. Break down food and absorb nutrients
2. b. Small intestine
3. Muscle tissues contract to churn food, and specialized stomach cells secrete enzymes for digestion.
4. b. Kidneys