the eye, the brain, the reflex arc, homeostasis,blood glucose and the hypothalamus.
- Created by: chxrlottetaylor
- Created on: 20-10-20 19:42
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- the eye
- the brain
- homeostasis
- blood glucose levels
- the reflex arc
- stimulus for example heat
- the heat (the stimulus) is detected by receptors cells in the skin, an electrical impulse (neuron) travels along the sensory neuron
- at the end of the sensory neuron there is a junction known as a synapse.
- at the synapse a chemical is released which diffuses across to a relay neurone - in the CNS
- at the end of the relay neuron there is another synapse where another chemical is released which diffuses across to a motor nuerone.
- an electrical impulse (nuerone) travels to an effector such as a gland or a muscle.
- the muscle or gland then resonds to the situation by secreting a hormone (gland) or by contracting (muscle)
- in this case the effector is responding to heat so the muscle will comtract, pulling the person away from the heat source.
- the reflex arc doesnt interact with the contious part of the brain which reflexes automatic and rapid in order to protect from physical danger
- in this case the effector is responding to heat so the muscle will comtract, pulling the person away from the heat source.
- the muscle or gland then resonds to the situation by secreting a hormone (gland) or by contracting (muscle)
- an electrical impulse (nuerone) travels to an effector such as a gland or a muscle.
- at the end of the relay neuron there is another synapse where another chemical is released which diffuses across to a motor nuerone.
- at the synapse a chemical is released which diffuses across to a relay neurone - in the CNS
- at the end of the sensory neuron there is a junction known as a synapse.
- the heat (the stimulus) is detected by receptors cells in the skin, an electrical impulse (neuron) travels along the sensory neuron
- the central nervous system
- stimulus for example heat
- if blood glucose levels are too high
- the pancreas will produce insulin
- the glucose will be transported from the blood stream into cells
- once in liver or muscle cells the insulin will convert glucose into glycogen so that it can be stored
- the glucose will be transported from the blood stream into cells
- the pancreas will produce insulin
- if blood glucose levels are too low
- the pancreas will produce glucagon
- glucagon converts glycogen stored in the liver and muscle cells back into glucose
- the glucose is then transported back into the blood stream
- glucagon converts glycogen stored in the liver and muscle cells back into glucose
- the pancreas will produce glucagon
- type 1 diabetes
- is a genetic non-communicable disease which is the result of the bodies inability to produce sufficient insulin
- treatments
- the patient must regularly test their blood sugar levels and inject themselves with insulin if it is too high.
- treatments
- is a genetic non-communicable disease which is the result of the bodies inability to produce sufficient insulin
- type 2 diabetes
- is a non- communicable disease which is the result of a poor diet- high carbohydrate intake
- treatments
- type 2 diabetes is not permanent and can be corrected by a healthier diet or in sever cases insulin injections and medication.
- treatments
- is a non- communicable disease which is the result of a poor diet- high carbohydrate intake
- the reflex arc
- homeostasis is the regulation of internal conditions in order to maintain optimum conditions for the function of enzymes
- features of automatic control systems
- stimulus, receptor cells, coordination centre, an effector and a response
- receptor cells detect a stimulus
- an electrical impulse is sent to a coordination centre such as the brain, spinal cord or the pancreas.
- the coordination centre interprets information from receptor cells and send instructions to the effector
- an example of an effector is a muscle or a gland, which carries out a response in order to restore conditions.
- the coordination centre interprets information from receptor cells and send instructions to the effector
- an electrical impulse is sent to a coordination centre such as the brain, spinal cord or the pancreas.
- receptor cells detect a stimulus
- stimulus, receptor cells, coordination centre, an effector and a response
- features of automatic control systems
- the central nervous system
- blood glucose levels
- the hypothalamus
- the hypothalamus tracks and regulates body temperature
- nerves relay information about the skins surface temperature from thermoreceptors in the skin to the hypothalamus.
- the hypothalamus also contains thermoreceptors which detect change in the temperature of blood,
- nerves relay information about the skins surface temperature from thermoreceptors in the skin to the hypothalamus.
- if body temperature falls
- capillaries will constrict in order to prevent heat loss through gas exchange
- hairs will stand in order to trap a layer of warm air along the surface of the skin
- shivering increases body temperature as increased levels of movement require an increased rate of respiration, which is an endothermic reaction meaning it emits heat energy.
- if body temperature rises
- hair will lay flat against the skin to allow cool air to reach the surface of the skin
- sweating allows us to lose heat energy
- capillaries will expand allowing us to lose heat through gas exchange.
- the hypothalamus tracks and regulates body temperature
- the brain structure
- homeostasis
- the eye is a sense organ, which has receptors which detect light intensity and colour.
- cornea function= to focus light rays.
- the brain
- The lens focuses the light onto the back of the eye
- the lens changes its shape allowing it to focus on distant or closer objects this is known as accommodation
- Th ciliary muscles and suspensory ligaments work with the lens, allowing us to focus on objects
- pupil- light rays pass pass through the iris
- the iris control the size of the pupill which varys based on line intensity ie low light= larger pupil in order to allow the most light rays to enter to eye.
- cornea function= to focus light rays.
- retina - contains receptor cells and detect light intensity and colour
- receptor cells send nuerones down the optic nerve to the brain
- the lens changes its shape allowing it to focus on distant or closer objects this is known as accommodation
- pupil- light rays pass pass through the iris
- the iris control the size of the pupill which varys based on line intensity ie low light= larger pupil in order to allow the most light rays to enter to eye.
- the reflex arc
- stimulus for example heat
- the heat (the stimulus) is detected by receptors cells in the skin, an electrical impulse (neuron) travels along the sensory neuron
- at the end of the sensory neuron there is a junction known as a synapse.
- at the synapse a chemical is released which diffuses across to a relay neurone - in the CNS
- at the end of the relay neuron there is another synapse where another chemical is released which diffuses across to a motor nuerone.
- an electrical impulse (nuerone) travels to an effector such as a gland or a muscle.
- the muscle or gland then resonds to the situation by secreting a hormone (gland) or by contracting (muscle)
- in this case the effector is responding to heat so the muscle will comtract, pulling the person away from the heat source.
- the reflex arc doesnt interact with the contious part of the brain which reflexes automatic and rapid in order to protect from physical danger
- in this case the effector is responding to heat so the muscle will comtract, pulling the person away from the heat source.
- the muscle or gland then resonds to the situation by secreting a hormone (gland) or by contracting (muscle)
- an electrical impulse (nuerone) travels to an effector such as a gland or a muscle.
- at the end of the relay neuron there is another synapse where another chemical is released which diffuses across to a motor nuerone.
- at the synapse a chemical is released which diffuses across to a relay neurone - in the CNS
- at the end of the sensory neuron there is a junction known as a synapse.
- the heat (the stimulus) is detected by receptors cells in the skin, an electrical impulse (neuron) travels along the sensory neuron
- stimulus for example heat
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