6th Grade Science: Human Body Systems

How does the digestive system help the skeletal system in fracture healing?

• By providing oxygen

• By providing nutrients

• By providing enzymes

• By providing hormones

Why do nerve cells in the nervous system need nutrients?

• To grow in size

• To perform their function

• To communicate with each other

• To change shape

What is the importance of the nervous system for the heart muscles?

• It cleans the heart muscles

• It provides energy to the heart

• It controls the heart muscle

• It produces heart cells

Why are muscle cells in the form of long fibers?

• To store energy

• To allow movement

• To protect organs

• To produce heat

Why don't muscle cells work alone?

• Because they are very small in size

• Because they need energy

• Because they need oxygen

• Because they are connected to nerves

Why can't the skeletal system move without the muscular system?

• Muscles are heavier

• Muscles create blood

• Muscles attach to bones to allow movement

• Muscles store nutrients

Why are cardiac muscles considered involuntary muscles?

• They look different

• We can't control them

• They are very strong

• We can control them

Why do cardiac muscles contract and relax continuously?

• To produce hormones

• To generate heat

• To pump blood with oxygen to all body parts

• To store nutrients

Why are the muscles around the eyeball considered voluntary muscles?

• They are small

• They work automatically

• We can control their movement

• They are connected to the brain

What happens when the body faces a danger and heartbeats increase?

• The brain stops working

• The endocrine system secretes hormones that increase heartbeats

• Heartbeat slows down

• Muscles relax