Unit 2
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Physiological Systems
There are 11 physiological systems that we will study in this class. "RUN MRS. LIDEC" is a mnemonic for remembering them.
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R = Respiratory
U = Urinary N = Nervous M = Muscular R = Reproductive S = Skeletal L = Lymphatic I = Integumentary D = Digestive E = Endocrine C = Cardiovascular |
Homeostasis
The term homeostasis refers to a state of equilibrium the body, or the idea of a stable state of condition within the body. Communication throughout the body is vital to ensure homeostasis. Homeostasis is often accomplished through interactions between the endocrine and nervous systems.
The control center, often the brain, sets the level (set point) for your body that is tried to be maintained. Other components of a homeostatic system are the receptor and effector. The receptor senses and monitors the environment and will report to the control center along afferent pathways. If there are any deviations from the set point, the receptor will let the control center know and the control center will determine the correct response to take. The control center lets the effector (output) know what steps to take through efferent pathways. The effector may act by shutting the mechanism off, or increasing the response in order to restore homeostasis. MNEMONIC: You can remember the direction of the pathways because the Afferent (input) pathways occurs before the Efferent (output) pathway, and A comes before E in the alphabet. |
Anatomical and Medical Terminology
The woman below is in the anatomical position. It is important to know this position because when we refer to positions of organs, bones, injuries, etc. we assume this position in order to avoid confusion. The anatomical position has these characteristics:
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Click the button below to take a terminology practice quiz.
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