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16 Cards in this Set
- Front
- Back
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Define Homeostasis |
The maintenance of a relatively stable internal environment |
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What is a stimulus |
A thing or event that evokes a specific functional reaction in an organ or tissue |
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What is the nervous system |
The network of nerve cells and fibres which transmits nerve impulses between parts of the body and is called a communication system. |
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What is the endocrine system |
The endocrine system is a collection of glands that produce and secrete hormonesand chemical substances that are produced in the human body to regulateactivity of cells or organs |
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How do the endocrine and nervous systems coordinate? |
The Hypothalamus connects the two systems together and hormones provide feedback to the brain to affect neural processing. Reproductive hormones affect the development of the nervous system. |
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What is a sensory neuron |
Detect stimuli and bring messages to the CNS for processing |
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What is a motor neuron |
Bring messages from the CNS to muscles which carry out a response |
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What is a reflex arc |
A reflex arc is when a message is sent from the receptors to the sensory neuron only instead of going to the brain |
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What are endocrine glands |
Anendocrine gland is a gland that produce hormones. They are transmitted throughthe blood rather than through a duct |
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What are hormones and their mode of function? |
Hormones are a regulatory substance produced in an organism and transported in tissue fluids such as blood or sap to stimulate specific cells or tissues into action from the specific endocrine gland |
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What is diffusion |
Diffusion is the movement of molecules and particles from a high point of concentration to a lower point of concentration |
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What is the role of the alveoli |
Gas exchange of oxygen and carbon dioxide |
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What is the role of Villi |
Villi increase the surface area of the small intestine and contain specialised cells that transport substances into the bloodstream. The help in absorption in the small intestine. |
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What is metabolism |
Thechemical processes that occur within a living organism in order to maintainlife |
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What is the role of enzymes on carbohydrates, proteins and lipids |
Enzymes work as a catalyst and break down the complex molecule into simple molecules which then are small enough to travel into the bloodstream. |
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What produces glucose |
Glucoseis produced to bring our insulin levels back down and is produced by thepancreas |
