Food in the body
Regulates Distrib. Removes
temp. nutrients. waste products.
Fruit Vegetables Dairy
Adds ...to... Prevents
bulk faeces. constipation
Provides Produces Digests
energy. hormones. and absorbs foods
Dairy Animal Products
Building muscles, skin, hair and
bones, cartilage, blood nails
Building bones Transmi nerve
strong as well as tting impulses
Enzymes are chemicals that speed up chemical reactions.
- Carbohydrase – breaks carbohydrate into smaller sugars.
- Protease – breaks protein into amino acids.
- Lipase – breaks fat into fatty acids and glycerol.
Responsibilities of blood
Blood is responsible for:
• Transporting gases (Oxygen, Carbon dioxide)
• Transporting water
• Transporting Nutrients
• Transporting Wastes
• Delivering immune cells to fight disease
• Transporting heat
Diseases associated with obesity
• High blood pressure
• Cardiovascular disease
• Some cancers
• Type 2 diabetes
The recommended daily intake of kilo-joules for an adult - 8700
Factors that increase the risk of obesity:
- Genetics (Obese parentage)
- Eating more kilojoules than you use
- Inactivity (Exercise)
- Modern living (Cars, computers)
- Socioeconomic factors (Money and Education)
Cellular respiration is the process of taking in oxygen to produce energy, water and carbon dioxide.
The role of the circulatory system is to carry oxygen to tissues, wastes away from tissues and nutrients water and heat around the body.
Blood in the heart
From the body
Superior/Inferior Vena Cava
Carbon Dioxide out/Oxygen in
To the Body
What is in our breath
% in inhaled air
% in exhaled air
Inhalation and Exhalation
Inhalation. Ribcage moves outward and the lungs expand, Air moves in, Diaphragm moves down, volume of chest cavity increases, intercostal muscles contract, decreases pressure in chest cavity.
Exhalation, ribcage moves inward and the lungs contract, air moves out, diaphragm moves up, volume of chest cavity decreases, intercostal muscles expand, increases pressure in chest cavity.
Breathing out is called relaxing, breathing in is called contracting.
Add 10 drops reagent 80oc for 5 min
Add 3 drops reagent
Purple-Black with residue
Add 10 drops NaOH And 10 drops CaSo4
Biurets (NaOH + CaSo4)
Change in colour
Rub sample on brown paper
Sinks into paper
Components of cells
White blood cells
Invisible unless stained
Red blood cells
1/4 size of white blood cell
Carry oxygen around the body,
Liquid portion of blood
Where carbon dioxide is dissolved.
Help clot the blood
In the lungs, oxygen travels to thousands of tiny air sacs called alveoli.
These are covered in capillaries, The increased surface area-because of these tiny air sacs- paired with thin walls, increase the rate of gas diffusion into/from the capillaries