Nerves and Hormones
- Created by: KateLB
- Created on: 07-12-13 13:31
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- Nerves and Hormones
- Hormones
- Definition: Hormones are chemicals secreted by different glands in our body.
- They control conditions in our body and co-ordinate processes.
- The bloodstream transports hormones to different organs
- Types/names of hormones
- Thyroxine is produced in the thyroid gland and controls the rate of metabolism
- Hypothalamus is produced in the brain and controls the pituitary gland
- Insulin
- Adrenaline
- Hormones in the menstrual cycle
- Promoting release of egg
- Follicile stimulating hormone (FSH) is secreted by the pituitary gland, it makes eggs mature in the ovaris. Also stimulates the ovaries to rpoduce oestrogen
- Luteinising hormone (LH) stimulates the release of eggs from the ovary
- Oestrogen is secreted by the ovaries and inhibits the production of FSH
- Promoting release of egg
- Artificial control, of fertility
- Oral contreceptives contain hormones (usually oestrogen or progesterone), which stop FSH production so no eggs mature
- Giving FSH and LH in a fertility drug to stimulate eggs to mature in their ovaries
- IVF treatment is where eggs are fetilised outside the mothers body then inserted back into the uterus as embreyos
- Definition: Hormones are chemicals secreted by different glands in our body.
- The nervous system
- Enables us to react to our surroundings and respond accordingly
- Consists of the brain and spinal cord
- When a receptor is stimulated it sends a signal along the nerve cells, also called neurons, to the brain. The brain then coordinates the response.
- Receptors are groups of cells that detect changes in the environment called stimuli.
- Receptors found in eyes = sensitive to light
- Receptors found in ears = sensitive sound and position of the head
- Receptors in skin = sensitive to pressure, pain and temperature
- Receptors are groups of cells that detect changes in the environment called stimuli.
- When a receptor is stimulated it sends a signal along the nerve cells, also called neurons, to the brain. The brain then coordinates the response.
- Consists of the brain and spinal cord
- Reflex actions
- Reflexes are rapid, automatic reactions
- Involve 3 types of neurone
- Neurons are nerve cells that carry information as tiny electric impulses
- Sensory neurones
- Carry signals from receptors to the spinal cord and brain
- Motor neurones
- Carry signals form the central nervous system to effectors
- Relay neurones
- Carry messages from one part of the central nervous system to another
- Involve 3 types of neurone
- Reflexes are rapid, automatic reactions
- Effectors are muscles or glands. muscles respond to the arrival of impulses by contracting, your glands respond by releasing (secreting) chemical substances
- Synapses are junctions between nerves, a chemical transmitter crosses the synaptic gap.
- Enables us to react to our surroundings and respond accordingly
- Control in the human body
- Condition that are controlled
- Water content: water leaves the body via the lungs, the skin when we sweat and via kidenys through urine.
- ion content: lost via skin when we sweat and kidneys when we uinate
- Temperature is controlled to maintain the best temperature for enzymes to work at
- Blood sugar levels: to provide the cells with a constant supply of energy
- Condition that are controlled
- Hormones
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