Lesson 3.2 grade 6 term 1

The lungs take in air when the diaphragm............ while they release the air when the diaphragm

• contracts contracts.

• contracts - relaxes.

• relaxes - relaxes.

• relaxes - contracts.

The system which helps the respiratory system in transporting oxygen gas from lungs to all the body organs is the ...........system.

• digestive

• nervous

• endocrine

• circulatory

Heart muscle is considered as voluntary muscle.

• True

• False

Heart is made of a type of involuntary muscles known as skeletal muscles.

• True

• False

Heart muscle contracts and relaxes all the time without stopping.

• True

• False

The muscles that help you move your eyes in different directions are considered as voluntary muscles.

• True

• False

Skeletal muscles are considered as involuntary muscles and work by contraction.

• True

• False

Endocrine system secretes hormones that control the increasing of your breathing rate during danger.

• True

• False

They are muscles that move automatically and you cannot control their movement.

The heart begins to beat quickly during normal situations.

• True

• False