Question

choose the best answer for the following questions:

1. which best summarizes the relationship between the muscular system and the cardiovascular system?

a. the heart is protected from injury by the breastbone
b. nutrients are carried to the heart by arteries and veins
c. messages are carried by nerves between the brain and the heart
d. the heart contracts and expands as it pumps blood throughout the body

1. which best describes the circulatory system?

a. it protects the major organs of the body.
b. it breaks food into nutrients for the body.
c. it sends messages to the brain to protect the body.
d. it transports oxygen - rich blood throughout the body.

1. melissa accidentally touches a hot surface and then quickly pulls her hand away. which two systems in the human body were involved with her action and reaction?

a. nervous and muscular
b. skeletal and circulatory
c. nervous and respiratory
d. muscular and respiratory

1. when someone is exercising, which is most likely a function of both the circulatory and respiratory systems?

a. to help the body sweat
b. to make the muscles work
c. to provide oxygen to the body
d. to protect bones from breaking

1. what role does the circulatory system provide to the digestive system?

a. it transports nutrients to cells.
b. it releases waste into the blood.
c. it moves food through the intestines.
d. it transports food particles to the muscles.

Explanation:

1. The heart (a cardiac muscle) contracts/expands (muscular action) to pump blood (cardiovascular function), linking the two systems.
2. The core function of the circulatory system is moving oxygen-rich blood to body tissues.
3. The nervous system detects the heat and sends signals, while the muscular system pulls the hand away.
4. The respiratory system takes in oxygen, and the circulatory system carries it to working muscles during exercise.
5. The digestive system breaks down food into nutrients, and the circulatory system transports these nutrients to all body cells.

Answer:

1. D. The heart contracts and expands as it pumps blood throughout the body
2. D. It transports oxygen-rich blood throughout the body.
3. A. nervous and muscular
4. C. to provide oxygen to the body
5. A. It transports nutrients to cells.