Body Systems and Senses — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Which habit best supports a strong circulatory system?
A) Skipping meals
B) Watching TV all day
C) Daily exercise
D) Holding your breath
Regular exercise strengthens the heart muscle and helps blood vessels stay flexible and healthy.
2. Which habit best helps the nervous system recover and work well?
A) Getting enough sleep
B) Eating only candy
C) Staying up all night
D) Skipping water
Sleep lets the brain process information, store memories, and reset so the nervous system performs well the next day.
3. Which choice supports a healthy digestive system?
A) Eating only fried snacks
B) Eating fruits, vegetables, and whole grains
C) Skipping breakfast every day
D) Drinking only soda
Fruits, vegetables, and whole grains provide fiber and nutrients that keep the digestive system moving smoothly.
4. Which habit helps protect the skeletal system and good posture?
A) Slouching while sitting
B) Avoiding all activity
C) Sitting and standing with good posture
D) Carrying very heavy backpacks daily
Good posture keeps the spine aligned, reduces strain on bones and muscles, and supports long-term skeletal health.
Part B: Fill in the Blank
Write the correct answer on each line.
1. Daily exercise helps keep the heart strong and improves blood flow.
Exercise makes the heart pump more efficiently and helps blood vessels stay open and healthy.
2. Getting enough sleep each night helps the nervous system rest and reset.
Sleep gives the brain time to organize information and recover, supporting clear thinking and good mood.
3. Eating healthy food provides nutrients that fuel every body system.
Balanced meals supply vitamins, minerals, and energy that all body systems need to work properly.
4. Sitting and standing with good posture keeps the spine and muscles in healthy alignment.
Good posture reduces stress on the skeletal and muscular systems and helps prevent back and neck pain.
5. Drinking enough water supports digestion and helps blood flow through the body.
Water keeps digestion moving, blood flowing, and cells working properly throughout the body.