Question

1. which of the following is the most likely function of this feedback loop?

a) breakdown of glucose in the liver
b) conversion of calcium to pth
c) regulation of glucose levels in the blood
d) storage of glucose in the pancreas

1. what is the primary function of the digestive system?

a) to regulate body temperature
b) to break down food for energy
c) to transport oxygen and nutrients to cells
d) to provide structural support to the body

1. which system is responsible for exchanging gases, such as oxygen and carbon dioxide, between the body and the external environment?

a) digestive system
b) lymphatic system
c) cardiovascular system
d) respiratory system

1. the main function of the circulatory system is to:

a) digest food and absorb nutrients
b) exchange gases, such as oxygen and carbon dioxide, with the environment
c) control the rate if the heart beating
d) to transport oxygen and nutrients to cells

Explanation:

• Question 11: The diagram shows the interaction between the pancreas (releasing glucagon and insulin), liver (glycogen breakdown and storage), and tissue cells (glucose uptake). This is a classic example of glucose - level regulation. Glucagon is released when blood sugar is low (breaks down glycogen in the liver to release glucose), and insulin is released when blood sugar is high (stimulates glucose uptake by tissue cells and storage in the liver as glycogen).
• Question 12: The digestive system's main role is to break down food into smaller molecules (through mechanical and chemical digestion) so that the body can absorb nutrients and use them for energy.
• Question 13: The respiratory system (e.g., lungs) is responsible for gas exchange. Oxygen is taken in from the external environment and carbon dioxide (a waste product) is expelled.
• Question 14: The circulatory system (heart, blood vessels, blood) transports oxygen (from the lungs) and nutrients (from the digestive system) to cells throughout the body.

Answer:

1. C. regulation of glucose levels in the blood
2. B. To break down food for energy
3. D. Respiratory system
4. D. To transport oxygen and nutrients to cells