73850
Description
Mind Map by Safiya Caesar, updated more than 1 year ago
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Created by Safiya Caesar
about 12 years ago
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Homeostasis and excretion
- the maintenance of a constant internal
environment
- Homeothermic/endoithermic
animals can keep their
temperature almost constant
even though their environment
changes
- Poikilothermic/exothermic animals cannot
- Temperature Regulation
- Top layer - epidermis
- Cells in the epidermis were made in the
MALPIGHIAN LAYER Cellls ar constantly dividing
by mitosis. The new cells made move
towards the surface of the skin as they go
they die and fill up with a protein - KERATIN forming the CORNIFIED LAYER.
- Some cells in the epidermis contain a dark brown pigment - MELANIN. This
absorbs harmful UV rays in sunlight
- Some cells in the epidermis contain a dark brown pigment - MELANIN. This
absorbs harmful UV rays in sunlight
- The epidermis folds in forming hair follicles. hairs are made of
keratin.
- A SEBACEOUS GLAND opens from the side of each hair follicle
these make an oily substance called SEBUM which keeps the hair and
skin soft and supple
- A SEBACEOUS GLAND opens from the side of each hair follicle
these make an oily substance called SEBUM which keeps the hair and
skin soft and supple
- Cells in the epidermis were made in the
MALPIGHIAN LAYER Cellls ar constantly dividing
by mitosis. The new cells made move
towards the surface of the skin as they go
they die and fill up with a protein - KERATIN forming the CORNIFIED LAYER.
- Bottom layer - dermis
- Mostly made of connective tissue which contains elastic fibres and collagen fibres.
- Sweat glands secrete sweat
- Blood vessels and nerve endings
- A layer of fat called ADIPOSE TISSUE below the
dermis helps insulate the body
- Mostly made of connective tissue which contains elastic fibres and collagen fibres.
- The HYPOTHALAMUS is a part of the brain that coordinates the
activities of parts of the body that can bring about temperature
change
- It acts as a thermostat and works by sending electrical
impulses along nerves to parts of the body
- When hot.....
- Hair lies flat
- Vasodilation
- Sweat
- Hair lies flat
- When cold......
- Muscles work
- Metabolism may increase
- Hair stands up
- Vasoconstriction
- Muscles work
- Negative Feedback
- Where the hypothalamus stops the skin from acting to reduce or conserve heat
- Where the hypothalamus stops the skin from acting to reduce or conserve heat
- It acts as a thermostat and works by sending electrical
impulses along nerves to parts of the body
- Top layer - epidermis
- Control of blood glucose content
- Cells need steady supply of glucose to carry out respiration
- Carried out by the LIVER and PANCREAS
- Scattered throughout the pancreas are ISLETS OF
LANGERHANS. They make two hormones called glucagon and
insulin
- Insulin lowers blood sugar
- the liver cells absorb glucose from the blood.
Some is used for respiration, but some is
stored in the liver as the insoluble
polysaccharide glycogen
- the liver cells absorb glucose from the blood.
Some is used for respiration, but some is
stored in the liver as the insoluble
polysaccharide glycogen
- Glucagon raises blood sugar
- The liver cells break down glycogen into glucose
- The liver cells break down glycogen into glucose
- Insulin lowers blood sugar
- Scattered throughout the pancreas are ISLETS OF
LANGERHANS. They make two hormones called glucagon and
insulin
- Cells need steady supply of glucose to carry out respiration
- Excretion
- Deamination
- Kidneys -Ultra filtration
- Deamination
- the removal of toxic materilals, the waste
products of metabolism andsubstances of
excess requirements
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