Homeostasis and Response Flashcards Flashcards

AQA GCSE Biology (8461)

Homeostasis

The regulation of internal conditions to maintain a stable internal environment in response to internal and external changes.

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Terms in this set (14)

1

Homeostasis

The regulation of internal conditions to maintain a stable internal environment in response to internal and external changes.

2

Receptor

A cell or organ that detects changes in the environment (stimuli).

3

Effector

A muscle or gland that brings about a response to restore optimum conditions.

4

Coordination centre

Processes information from receptors and organises a response (e.g., brain, spinal cord, pancreas).

5

Negative feedback

A mechanism that restores a level back to its optimum when it deviates too far from the normal range.

6

Nervous system

A system that enables humans to react to their surroundings and coordinate their behaviour.

7

Reflex action

A rapid, automatic response to a stimulus that does not involve conscious thought.

8

Synapse

The gap between two neurones where chemical signals (neurotransmitters) are transmitted.

9

Endocrine system

A of glands that secrete hormones into the bloodstream regulate body functions.

10

one

A chemical messenger produced by a gland and transported in the blood to a target organ.

11

moregulation

The process of maintaining a constant body temperature.

12

Blood glucose regulation

The control of blood sugar levels by the hormones insulin and glucagon, produced by the pancreas.

13

Ins

A hormone that lowers blood glucose levels promoting the conversion of glucose to glycogen in the.

14

Glucagon

A hormone that raises blood glucose levels by promoting the conversion of glycogen to glucose in the liver.

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