B4
- Created by: A.Delle21
- Created on: 06-01-17 17:37
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- B4
- Homeostasis
- Maintaining a constant internal environment
- Maintain core body temperature at 37 degrees C.
- Negative feedback ensures that in control systems that changes are reversed and returned to the set level.
- Controls body temperature, blood oxygen levels and salt levels
- Feet and hands feel cold first because body works to maintain constant core temperature
- Negative feedback ensures that in control systems that changes are reversed and returned to the set level.
- Receptors > Processing Centre > Effectors
- Receptors detect change
- Processing centre receives information and coordinates a response
- Effectors produce the response
- Maintain core body temperature at 37 degrees C.
- Strenuous exercise and living in hot/cold environment effects body temp and water content
- Maintaining a constant internal environment
- Urine
- Temporarily stored in the bladder
- Made up of urea, some water and some salts
- Concentration changes depending on external temperature, exercise levels and intakes of fluids and salts
- Thermoregulatory centre is in the brain
- Glucose
- Body cells get their constant supply of energy from glucose
- Pancreas creates insulin which causes glucose to move from the blood into the cells
- When the blood glucose is too high more insulin is released
- Diabetics can't control their blood glucose levels
- When the blood glucose is too high more insulin is released
- Diffusion
- Takes place in the lungs: oxygen diffuses across the alveolar walls into the blood
- When particles move from a region of high concentration to a region of low concentration
- Diffusion
- Takes place in the lungs: oxygen diffuses across the alveolar walls into the blood
- When particles move from a region of high concentration to a region of low concentration
- When particles move from a region of high concentration to a region of low concentration
- In a plant leaf CO2 moves from the air spaces between the mesophyll cells to the chloroplast
- Osmosis is a special type of diffusion. It involves water
- Equilibrium
- When the concentrationis the same on both sides
- Takes place in the lungs: oxygen diffuses across the alveolar walls into the blood
- Diffusion
- When particles move from a region of high concentration to a region of low concentration
- In a plant leaf CO2 moves from the air spaces between the mesophyll cells to the chloroplast
- Osmosis is a special type of diffusion. It involves water
- Equilibrium
- When the concentrationis the same on both sides
- Takes place in the lungs: oxygen diffuses across the alveolar walls into the blood
- Enzymes
- Enzymes speed up chemical reactions that keep cells alive and make them do their job
- If the temperature gets too high the enzymes are denatures and stop working
- A specific molecule binds to the enzyme in the active site and a reaction occurs
- Active transport
- Dissolved molecules move across cell membrane from lower concentrationto higher concentration
- Particles move against concentrationgradienj which requires input of energy from cell
- Takes place in humans during digestion of food in small intestine
- Particles move against concentrationgradienj which requires input of energy from cell
- Dissolved molecules move across cell membrane from lower concentrationto higher concentration
- Hypothalamus
- Processing centre in brain that controls body temperature
- Nerve impulses sent by it to skin which increases/decreases heat loss from body's surface
- Vasodialation and Vasoconstriction
- Blood vessels supplying blood to the skin swell/dialate
- Controlled by signals along nerves from the hypothalamus
- Vasodialation and Vasoconstriction
- Homeostasis
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