Respiration & Digestion Y8 Flashcards
(32 cards)
Breathing
The movement of air in and out of the lungs
Trachea (windpipe)
Carries air from the mouth and nose to the lungs
Bronchi
Two tubes which carry air to the lungs
Bronchioles
Small tubes in the lung
Alveoli
Small air sacs found at the end of each bronchiole
Ribs
Bones which surround the lungs to form the ribcage
Diaphragm
A sheet of muscles found underneath the lungs
Lung volume
Measure
Oxygen demand
What determines our breathing rate
Gas exchange
The movement of oxygen into the blood and carbon dioxide into the lungs
Balanced diet
Consuming a wide range of nutrients in the correct proportion
Digestion
The process of breaking down food into smaller, soluble molecules
Mechanical digestion
Physically breaking food into smaller pieces.
e.g chewing
Chemical digestion
Breaking food down with enzymes and acid
Saliva
It starts chemical digestion
Large intestine
Absorbs water from undigested waste
Digestion
Breaking down of molecules into smaller soluble molecules
Stomach
Enzymes digest proteins and acid kills harmful bacteria
Small Intestine
Villi absorb most of the products of digestion
Carbohydrates
They give you energy
Proteins
They help your body grow and repair itself
Fats
They provide energy and warmth
Fibre
It helps you digest your food
Minerals and Vitamins
They are good for your skin ,bones , blood and teeth and general health
