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Excretion | Definitions
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Excretion | Definitions
Active Transport
The movement of molecules against a concentration gradient, from an area of low concentration to an area of high concentration. This requires energy in the form of ATP.
Ectotherm
Cold-blooded organisms that rely on their external environments to control their body temperature.
Endotherm
Warm-blooded organisms that have an internal source of heat.
Excretion
The removal of waste products of metabolism from the body.
Homeostasis
The ability to maintain a stable internal state that persists despite changes in the world outside.
Nephron
The functional unit of the kidney.
Osmoregulation
The regulation of water and salt concentration in the fluids of an organism.
Osmosis
The movement of water molecules from an area of higher water concentration to an area of lower water concentration through a semipermeable membrane.
Piloerection
When hairs on our body stand up due to contraction of the hair erector muscle.
Vasoconstriction
The narrowing of blood vessels which increases blood pressure and prevents blood from reaching the surface of the skin.
Vasodilation
The widening of our blood vessels which allows more blood to flow close to the surface of our skin.
Sweating
The cool down of the body by the release of sweat from the sweat glands.
Shivering
The skeleton's muscles generate heat by contracting and relaxing quickly.
Epidermis
The uppermost layer of skin.
Secretion
The process where substances are passed from one place to another, e.g. from the efferent arteriole into the nephron tubules.
Reabsorption
The process by which useful substances that are in the glomerular filtrate are returned to the blood.
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Active Transport
The movement of molecules against a concentration gradient, from an area of low concentration to an area of high concentration. This requires energy in the form of ATP.
Ectotherm
Cold-blooded organisms that rely on their external environments to control their body temperature.
Endotherm
Warm-blooded organisms that have an internal source of heat.
Excretion
The removal of waste products of metabolism from the body.
Homeostasis
The ability to maintain a stable internal state that persists despite changes in the world outside.
Nephron
The functional unit of the kidney.
Osmoregulation
The regulation of water and salt concentration in the fluids of an organism.
Osmosis
The movement of water molecules from an area of higher water concentration to an area of lower water concentration through a semipermeable membrane.
Piloerection
When hairs on our body stand up due to contraction of the hair erector muscle.
Vasoconstriction
The narrowing of blood vessels which increases blood pressure and prevents blood from reaching the surface of the skin.
Vasodilation
The widening of our blood vessels which allows more blood to flow close to the surface of our skin.
Sweating
The cool down of the body by the release of sweat from the sweat glands.
Shivering
The skeleton's muscles generate heat by contracting and relaxing quickly.
Epidermis
The uppermost layer of skin.
Secretion
The process where substances are passed from one place to another, e.g. from the efferent arteriole into the nephron tubules.
Reabsorption
The process by which useful substances that are in the glomerular filtrate are returned to the blood.