Conditions inside the body must be controlled within narrow limits
blood glucose concentration.
The theory of evolution states that evolution happens by natural selection.
- Individuals in a species show a wide range of variation.
- This is because of differences in genes.
- Individuals most suited to the environment are more likely to survive and reproduce.
- The genes that allowed the individuals to be successful are passed to the offspring in the next generation.
Key Terms (A)
Active Transport: movement of molecules through partially permeable cell membranes
Adaptation: The process of getting used to the environment.
Aerobic respiration: Respiration using oxygen from the atmosphere
Anaerobic Respiration: The process of respiration without using oxygen from the air.
Antibody: A protein molecule that protects the body from invading cells
Asexual Reproduction: without producing gametes. An example of this is cloning.
Artery- A blood vessel which transports oxygenated blood.
Key Terms (B)
Bacteria: A type of single-celled organism without a nucleus. Bile: An alkaline fluid produced in the liver to aid digestion and the breaking down of food molecules. Biomass: The mass of living organisms in a certain area. Biodegradable: A substance that will be broken by natural processes. Bladder: A muscular sac that contains and ejects urine. Brain: The organ that coordinates the actions and responses of the body. Bronchiole: A small branch of bronchus which connects a bonchus to the alveoli. Bronchus: A tube that connects the trachea to the lungs.
Key Terms (C)
Capillary: The smallest blood vessel, through which substances are exchanged to and from the blood.
Carbohydrates: A groups of foods which provide energy
Catalyst: A substance that speeds up a chemical reaction
Chlorophyll: The green pigment in leaves which absorbs light for photosynthesis
Chloroplasts: Structures in a plant cell which contain chlorophyll
Diffusion: The movement of molecules from an area of high concentration to an area of low concentration
Before Diffusion During Diffusion After Diffusion
(High concentration) (Movement//Diffusion) (diffused)
Key Terms (E)
Enzymes: Biological catalysts found in the body
Evolution: The change overtime in the genes of species
Osmosis: Diffusion of water molecules through a partly permeable surface
For osmosis to happen you need:
* two solutions with different concentrations
* a partially permeable membrane to separate them