Biology revision

The Basics of Homeostasis. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Exercise Climate. Sweat Heat generation Breathing rate increases. Salt levels decrease (sweating) Hot climates have the same effect as exercise. Cold climates can cause your body temperature to decrease rapidly.

Questions. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Negative feedback ,[object Object],[object Object],[object Object],Receptor = detects the stimulus (change). Processing Centre (brain) = receives the information and coordinates a response. Effectors = produce the response which counteracts the change. Some effectors work antagonistically. For example one heats and the other cools. This enables it to produce a very precise temperatures. This mechanism allows a more sensitive response.

Diffusion ,[object Object],[object Object],[object Object],[object Object],[object Object]

Questions. ,[object Object],[object Object],[object Object],[object Object],[object Object]

Osmosis ,[object Object],[object Object],[object Object],[object Object],[object Object]

Questions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Enzymes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Question. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Controlling Body Temperatures ,[object Object],[object Object],[object Object],[object Object],Too hot. Too cold. Blood vessels dilate (get bigger) (vasodilatation) This allows more heat to escape. The sweat gland produce more sweat to cool the body down. Blood vessels constrict (get smaller) (Vasoconstriction) This allows less heat to escape. The body shivers (muscles contract rapidly), This increases the rate of respiration and warms the tissue surrounding the muscle.

Questions ,[object Object],[object Object],[object Object],[object Object],[object Object]

Heat Stroke ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Heat Stroke is caused by an uncontrolled increase In body temperature. Although sweating does cool down the body down, it also makes the body become dehydrated.

Questions ,[object Object],[object Object],[object Object],[object Object]

Hypothermia ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Hypothermia occurs when the core body temperatures falls below 35 degrees.

Questions. ,[object Object],[object Object],[object Object]

DNA – Making Proteins . ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Questions. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Cell Division – Mitosis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1 The cell has to copy everything it contains so that when it splits both cell have the same content. The number of organelles increases during cell growth. The chromosomes are, so that the cell has two copies of it’s DNA.

Cell Division – Meiosis. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Questions. ,[object Object],[object Object],[object Object],[object Object]

Development from a single cell. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Cloning could also be used to make Stem cells.

Growth in Plants ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Phototropism and Auxins. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Auxins help cuttings grow Into full plants. If you just stick a cutting in soil it wont always grow. If you add rooting powder it makes a good result more likely. Rooting powder contains Auxins. This helps produce clones in the easiest way.

Learning and modifying reflexes.

Brain development and learning

Learning skills and behaviour.

Biology revision

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