science revision - body systems

for upcoming test

Respiratory system –

Includes the lungs and airways; brings oxygen into the body and removes carbon dioxide.

Digestive system and its organs-

Breaks food into smaller parts so nutrients can be absorbed; main organs include the mouth, stomach, and intestines

Excretory (urinary) system

Removes waste like urea and extra water through the kidneys, bladder, and urethra.

Skeletal system –

Supports the body, protects organs, and helps with movement.

Muscular system –

Works with bones to move the body; also helps organs like the heart and stomach work.

Nervous system –

Controls and coordinates body actions; includes the brain, spinal cord, and nerves.

Circulatory + respiratory link –

The lungs add oxygen to the blood, and the circulatory system carries that oxygen around the body.

muscles

→ muscular system

Bones

→ skeletal system;

Brain sending signals to move your arm

nervous system.

what do the lungs do?

they gas exchange (oxygen in, carbon dioxide out.)

Heart —

Pumps blood around the body.

Blood vessels —

Tubes (arteries, veins, and capillaries) that carry blood.

Blood —

Fluid that carries oxygen, nutrients, and waste.

Trachea —

Windpipe that air travels through to reach the lungs.

Bronchi and bronchioles —

Smaller air tubes inside the lungs that carry air to the alveoli.

Diaphragm —

Muscle below the lungs that helps you breathe in and out.

Mouth —

Starts digestion by chewing food and mixing it with saliva.

Oesophagus —

tube that carries food from the mouth to the stomach.

Stomach —

Uses acid and enzymes to break down food.

Small intestine —

Absorbs nutrients into the blood.

Large intestine — 

absorbs water and creates solid waste.