3.3 Unit 1: Biology 1
B1.1 Keeping healthy
A combination of a balanced diet and regular exercise is needed to help keep the body healthy. Our bodies provide an excellent environment for many microbes which can make us ill once they are inside us. Our bodies need to stop most microbes getting in and deal with any microbes which do get in. Vaccination can be used to prevent infection. Candidates should use their skills, knowledge and understanding to: ■ evaluate information about the effect of food on health
Additional guidance: Candidates will be given data to work from.
evaluate information about the effect of lifestyle on development …show more content…
b) Cells called receptors detect stimuli (changes in the environment). Receptors and the stimuli they detect include:
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Knowledge and understanding of the structure and functions of sense organs such as the eye and the ear are not required.
receptors in the eyes that are sensitive to light receptors in the ears that are sensitive to sound receptors in the ears that are sensitive to changes in position and enable us to keep our balance receptors on the tongue and in the nose that are sensitive to chemicals and enable us to taste and to smell receptors in the skin that are sensitive to touch, pressure, pain and to temperature changes.
c) Light receptor cells, like most animal cells, have a nucleus, cytoplasm and cell membrane.
A knowledge of the functions of the cell components is not required.
d) Information from receptors passes along cells (neurones) in nerves to the brain. The brain coordinates the response. Reflex actions are automatic and rapid. They often involve sensory, relay and motor