Coordination and Response in Humans

Mind Map by , created about 6 years ago

Cambridge IGCSE Biology (Coordination and Response) Mind Map on Coordination and Response in Humans, created by MusicGirl98 on 09/29/2013.

Created by MusicGirl98 about 6 years ago
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Coordination and Response in Humans
1 Homeostasis
1.1 The ability of an organism to maintain a constant internal environment in response to changing environmental or internal conditions
1.2 Negative feedback
1.2.1 If a particular variable (e.g. temperature) moves away from its normal value, different mechanisms work together to bring it back to the norm
2 Thermoregulation
2.1 Heat given off by
2.1.1 F - Blood flow in capillaries increases Vasodilation
2.1.2 D - Hair muscles relax. Hairs lie flat so heat can escape.
2.1.3 E - Sweat secreted by sweat glands. Cools skin by evaporation.
2.1.4 Skeletal muscles shiver - energy released due to increased movement
2.2 Heat conserved by
2.2.1 C - Blood flow in capillaries decreases. Vasoconstriction
2.2.2 A - Hair muscles pull hairs on end.
2.2.3 B - Erect hairs trap air.
2.3 Thermoregulatory centre in brain
2.3.1 receptors which are sensitive to temperature of blood flowing through the brain
2.3.2 Impulses from skin recepors
3 Nervous system
3.1 Receptors detect a stimulus
3.1.1 Sensory neurones carry electrical impulses to spinal cord Relay neurones carry the impulses in the spinal cord Motor neurones carry the impulses to the effector Effectors carry out the response Reflex Arc - Sensory, Relay, Motor sticky out circle means sensory
3.2 Responds to change
3.2.1 Fast, short lived response
3.3 Central Nervous System decides what to do
3.4 Effectors are a muscle or gland
3.4.1 NOT a part of nervous system
4 Hormones
4.1 Responds to change
4.1.1 Slow, long lasting response
4.2 ADH
4.2.1 Increased permeability of kidney tubules to water, so more water is reabsorbed and less urine is produced Pituitary gland
4.3 Adrenaline
4.3.1 'Fight or flight' hormone, increases heart and breathing rate, diverts blood flow to skeletal muscles and brain Adrenal glands
4.4 Insulin
4.4.1 Produced when blood glucose level increases. Enables the liver to convert glucose to glycogen for storage. Pancreas
4.5 Testosterone
4.5.1 Development of male secondary sexual characteristics Testes
4.6 Oestrogen
4.6.1 Development of female secondary sexual characteristics, control of the menstrual cycle Ovaries
4.7 Progesterone
4.7.1 Maintains the uterus lining (endometrium) during pregnancy Ovaries
5 The Eye
5.1 Iris Reflex
5.1.1 Bright Light Circular muscles contract, Pupil constricts, Less light enters eye
5.1.2 Dim Light Radial muscles contract, Pupil dilates, More light enters eye