Biology B3 - Homeostasis
- Created by: gracedunn55
- Created on: 09-05-15 17:21
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- Homeostasis
- Temperature
- Too Cold
- Shivering
- Thermo-regulatory centre sends impulse to muscles to contract more
- Requires more respiration which produces heat energy
- Thermo-regulatory centre sends impulse to muscles to contract more
- Vaso Constriction
- Receptor cells in the skin detect the change
- Sends impulse to thermo-regulatory centre in the brain
- Arterioles near the skin surface constrict
- Allows less blood to flow to the skin capillaries
- Less heat radiating from the skin
- Allows less blood to flow to the skin capillaries
- Arterioles near the skin surface constrict
- Sends impulse to thermo-regulatory centre in the brain
- Receptor cells in the skin detect the change
- Hairs Stand Up
- Hairs on the skin's surface become erect
- Hair can trap heat and provide insulation for the skin
- Hairs on the skin's surface become erect
- Shivering
- Too Hot
- Sweating
- Water and mineral ions lost from the body in sweat. Can cause dehydration.
- Water evaporates from the body when temperatures are too high.
- Sweat glands in the skin release more sweat which contains heat
- Average internal body temperature is 37 degrees
- Vaso Dilation
- Receptor cells in the skin detect the change
- Sends an impulse to the thermo-regulatory centre in the brain
- Receptor cells in the skin detect the change
- Sweating
- Too Cold
- Blood Glucose
- Low Glucose Levels
- Pancreas receptor cells detect the change
- Pancreas releases glucagon which travels in the blood to the liver (effector)
- Liver converts the glycogen back into glucose.
- This travels in the blood, raising the blood glucose concentration
- Liver converts the glycogen back into glucose.
- Pancreas releases glucagon which travels in the blood to the liver (effector)
- Pancreas receptor cells detect the change
- High Glucose Levels
- Pancreas receptor cells detect the change
- Pancreas releases the hormone insulin which travels in the blood to the liver (effector)
- Liver converts glucose from the blood into glycogen for storage
- Pancreas releases the hormone insulin which travels in the blood to the liver (effector)
- Pancreas receptor cells detect the change
- Low Glucose Levels
- Waste Products
- Urea
- Produced in the liver
- Produced when excess amino acids are broken down
- Toxic, can build up in the body
- Removed from the blood in the kidneys by filtration
- Removed from the body in urine (stored in bladder)
- Produced in the liver
- Carbon Dioxide
- Produced during aerobic respiration
- Removed from the body when we breathe out
- Urea
- Water and Mineral Ions
- Sweat
- If water levels are too high, more water will be released in sweat or urine
- Urine
- High Water Levels
- Hypo-thalamus detects the change in water levels
- Pituitary gland releases less ADH
- Kidneys reduce water level
- So more water is lost in urine
- Kidneys reduce water level
- Pituitary gland releases less ADH
- Hypo-thalamus detects the change in water levels
- High Water Levels
- Selective Reabsorption
- In a kidney tubule, water and mineral ions are filtered out of the blood
- Depending on the need, water and mineral ions are reabsorbed
- This is known as Selective Reabsorption
- Depending on the need, water and mineral ions are reabsorbed
- In a kidney tubule, water and mineral ions are filtered out of the blood
- Sweat
- Temperature
- Allows more blood to flow to the skin capillaries
- More heat radiates out of the skin
- Hypo-thalamus detects the change in water levels
- Low Water Levels
- Urine
- High Water Levels
- Hypo-thalamus detects the change in water levels
- Pituitary gland releases less ADH
- Kidneys reduce water level
- So more water is lost in urine
- Kidneys reduce water level
- Pituitary gland releases less ADH
- Hypo-thalamus detects the change in water levels
- High Water Levels
- Urine
- Pituitary gland releases ADH
- Kindeys maintain water level
- So less water is lost in urine
- Kindeys maintain water level
- Low Water Levels
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