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

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

Heart muscle is considered as voluntary muscle.

Heart muscle contracts and relaxes all the time without stopping.

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

All skeletal muscles are considered as involuntary muscles and work by contraction.

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

The heart begins to beat quickly during normal situations.

When the heartbeats increase, the blood pressure increases also.

Trachea is the only airway through which oxygen passes.

In dangerous situations, the body sends more oxygenated blood to the muscles and brain to face the danger.

Blood transports oxygen gas only to all the body organs and tissues.

Upper arm muscles are considered as voluntary muscles.

Among the muscles which you cannot control their movement are _______.

The diaphragm helps you breath in when it _______ and breath out when it _______.

Heart muscles _______ to pump the blood carrying oxygen to all body cells.

Among the organs which contain both involuntary and voluntary muscles is the _______.

Skeletal muscles work in pairs when _______.

Among the functions of endocrine system is _______.

All of the following happen by the help of endocrine system to face or to run away from danger, except _______.

All the following are from types of blood vessels, except _______.

Circulatory system can transport all of the following substances through all the body parts, except _______.

The systems of the human body get their needed energy from _______.

All the following are from the nutrients that the food contains, except _______.

The system which converts the complex food into simpler substances that the body can use for energy and growth is the _______ system.

You can use your _______ muscles to help the teeth chew the food.

Digestion process starts in your _______.

The function of saliva inside your mouth is _______.

The organ which belongs to the digestive system and secretes fluids contain an acid and some enzymes is the _______.

Breaking down of food occurs by secreting some enzymes and juice by the help of _______ in the small intestine.

Absorption of nutrients inside the body occurs in the _______.

Walls of small intestine contain _______ which are responsible for absorbing nutrients of digested food.

Blood carries _______ formed inside small intestine to all the body organs.

The large intestine absorbs _______ from the undigested food.

The part of large intestine which stores the feces until it leaves the body is the _______.

The organs which can store glucose and convert it into glycogen are _______.

The system which helps the digestive system in transporting the nutrients to all different body organs is the _______ system.

The body gets rid of waste materials by _______ process.

The excretion process is necessary to _______.

All the following are responsible for excretion process, except _______.

The organ which is responsible for secreting sweat is the _______.

All the following are from the waste materials which are produced by your body, except _______.

Among the organs which belong to urinary system are _______.

The two kidneys play an important role in the filtration of _______ inside your body.