Question

1. the interaction of these two parts of the human body results in a system that

a) breaks down food energy and turns it into heat.
b) circulates oxygen - filled blood throughout the body.
c) turns the protein in blood into food energy for the digestive system.
d) removes old blood from the body.

1. what body systems are related to taking in nutrients and expelling (get rid of) them from the body?

a) nervous and circulatory
b) endocrine and excretory
c) digestive and excretory
d) digestive and circulatory

Explanation:

For question 13:

• The heart circulates blood. The lungs oxygenate the blood. So together, they circulate oxygen - filled blood throughout the body.
• Option A: Turning food energy into heat is not the combined function of heart and lungs.
• Option C: Turning proteins in blood into food energy is not relevant to heart - lung interaction.
• Option D: Removing old blood is not the main combined function.

For question 14:

• The digestive system takes in nutrients. The excretory system gets rid of waste.
• The nervous system is for communication (not for taking in nutrients and removing waste).
• The circulatory system is for transporting substances (not the main for taking in nutrients and removing waste).
• The endocrine system is for hormone regulation (not for taking in nutrients and removing waste).

Answer:

1. B. Circulates oxygen - filled blood throughout the body.
2. C. Digestive and Excretory.