Question

q1
which sequence best describes an interaction between the circulatory and endocrine system that helps maintain homeostasis?
a. blood vessel is damaged → platelets secretes insulin → blood vessel ruptures
b. body temperature increases → glands sweat → body temperature decreases
c. heart rate increases → blood vessels constrict → blood pressure increases
d. blood sugar levels rise → pancreas secretes insulin → blood sugar decreases
q2
what organ mixes the food with hydrochloric acid?
a. gallbladder
b. stomach
c. small intestine
d. large intestine
q3
how does digested food make it to the blood stream?
a it is absorbed into the blood through blood vessels
b. it passes through the gullet into the blood
c. it passes from the large intestine into the blood
d. none of the above
q4
what is the correct order in which food passes through the digestive system?
a. mouth, stomach, esophagus, small intestine, large intestine, rectum
b. mouth esophagus, stomach, large intestine, small intestine, and rectum
c. mouth, esophagus, stomach, small intestine, large intestine, and rectum
d. none of the above

Explanation:

Q1

• Option A: Platelets do not secrete insulin. Insulin is secreted by the pancreas. So this option is incorrect.
• Option B: This is an interaction between the integumentary (skin - related) and the thermoregulatory system (not endocrine and circulatory). So this option is incorrect.
• Option C: This is an interaction within the circulatory system (heart - blood vessels - blood pressure). There is no endocrine system involvement. So this option is incorrect.
• Option D: When blood sugar levels rise (stimulus), the pancreas (endocrine gland) secretes insulin. Insulin acts on cells (through the circulatory system) to take up glucose, thus decreasing blood sugar. This shows an interaction between the endocrine (pancreas) and circulatory (blood vessels, blood) systems to maintain homeostasis (blood sugar balance).

• The gallbladder stores bile, which is used for fat digestion in the small intestine. It does not mix food with hydrochloric acid.
• The stomach has gastric glands that secrete hydrochloric acid. Hydrochloric acid helps in activating pepsinogen (to pepsin) and also kills bacteria in the food.
• The small intestine has digestive enzymes (like pancreatic enzymes that are released into it) but does not secrete hydrochloric acid for mixing with food.
• The large intestine is mainly involved in water absorption and feces formation, not in mixing food with hydrochloric acid.

• Digested food (nutrients) is absorbed into the blood through the walls of the small intestine. The small intestine has a large surface area due to villi and micro - villi. These structures have blood vessels (capillaries) close to their surface. Nutrients pass through the epithelial cells of the villi and enter the capillaries.
• The gullet (esophagus) is just a passage for food to move from the mouth to the stomach. It is not involved in nutrient absorption into the blood.
• The large intestine mainly absorbs water. Most of the nutrient absorption occurs in the small intestine, not the large intestine.

Answer:

D. Blood sugar levels rise → Pancreas secretes insulin → Blood sugar decreases

Q2