Unit 2. REPRODUCTIVE SYSTEM

THE REPRODUCTIVE SYSTEM

Our reproductive system makes it possible for us to have babies.

The male reproductive system

The testicles produce sperm which is the male sex cell.

The testicles are located in a bag of skin called scrotum.

The penis is connected to the testicles by small tubes.

The urethra is a tube in the penis.

The sperm travel through the urethra to the outside of the body.

The female reproductive system

The two ovaries store and produce ova.

Ova are the female sex cells.

The uterus is connected to the ovaries by tubes.

The vagina is a muscular tube. It connects the uterus to the outside of the body.

The vulva is on the outside of the body and covers the opening of the vagina.

Unit 2. The digestive system

THE DIGESTIVE SYSTEM

The digestive system allows our body to obtain the nutrients it needs. 

Digestion begins in the mouth.

The food then travels down  the oesophagus and into the stomach.

The small intestine separates the nutrients from the waste.

The nutrients pass to the circulatory system and travel to the body cells.

The waste passes to the large intestine and leaves the body through the anus.

To know more about digestion you can watch this video

UNIT 2. Respiratory system

THE RESPIRATORY SYSTEM

The respiratory system is made up a group of organs that help us breathe.

We breathe in oxygen and breathe out carbon dioxide.

Air enters our lungs through the nose, mouth, trachea and bronchi. 

Oxygen then passes into our blood through the alveoli.

Carbon dioxide from our blood passes into lungs, also through the alveoli

The diaphragm is a strong muscle below the lungs which contracts when we breathe in and relaxes when we breathe out.

UNIT 2. EXCRETORY SYSTEM

EXCRETORY SYSTEM

Our excretory system excretes waste from our body.

Two organs called kidneys clean waste from our blood.

The waste combines with water to make urine.

Urine travels down two tubes called ureters and collects in a bag called the bladder. 

When the bladder is full, the urine leaves the body through the urethra.

Our body also eliminates waste though the skin. This waste is in the form of a liquid called sweat.

This is a video where we can see how the excretory system Works.

UNIT 2. BODY SYSTEMS

In this second unit, we will study the different systems that make up our body: functions and organs.

CIRCULATORY SYSTEM.

The circulatory system consist of :

• heart.
• blood vessels
• blood.

It moves blood though the heart and around the body. 

Blood gives our cells nutrients and oxygen they need. Blood also collects waste products, such us carbon dioxide.