Fitness

What does being physically fit mean: 

To be in a state of fitness and wellbeing makes you healthy. This can be done by going for walks, run, or playing sports. The body's ability to work efficiently, and effectively in work and leisure activities, be healthy, resist disease, and react to emergency situations.

What makes you physically unfit: Body (Breaking bones, being sit) Not eating healthy, Smoking and drugs.

The Respiratory System

- This system is basically the lungs which are responsible for the absorption of oxygen into the bloodstream and expelling carbon dioxide from the body.

- This occurs by breathing air into and out of the lungs.

- The oxygen moves from a high concentration (the air we breathe in) to a low concentration in the blood. This is scientific terms is called osmosis.

- Carbon dioxide moves in the opposite direction.

- Oxygen is vitally important to the human body as it is a major ingredient required to produce energy in the muscles.

Lungs:

--- Respiratory system:

- Brings oxygen into the body.

- It allows us to exhale carbon dioxide from our body.

The heart is basically a pumping station and pumps blood around the body and is made up of 4 chambers.

This pumping action creates what we know as our pulse.

The blood travels around the body in vessels called:

Arteries: Arteries have a muscular wall and takes blood away from the heart.

Arterioles: Small arteries

Capillaries: This is where nutrients and gases are exchanged.

Venuoles: Small vans

Veins: Veins don't have a muscular wall but have valve-like structures which prevent blood from flowing backward and takes blood to the heart.

The blood carries gasses and nutrients to the body and takes away waste products such as carbon dioxide.