15.1 homeostasis

0.0(0)
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/18

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

19 Terms

1
New cards

Homeostasis

Maintenance of stable internal environment within restricted limits in organisms.

2
New cards

Importance of Homeostasis

Keeps internal environment constant for metabolic reactions + ensures cells function properly to avoid damage.

3
New cards

Control Mechanisms

Homeostasis coordinated by receptors, coordinators + effectors throughout body.

4
New cards

Receptors

Sensory receptors detect stimuli and send signals to the brain about changes in the internal environment.

5
New cards

Coordinator

Receives and interprets information from receptors and sends instructions to an appropriate effector.

6
New cards

Effectors

Muscles or glands that act on signals from the brain to cause responses that reverse changes and regain equilibrium.

7
New cards

Negative Feedback Systems

Involve coordination between receptors and effectors to control conditions around set optimum points.

8
New cards

How Negative Feedback Works

receptors detect change, triggers effectors to produce responses that reverse initial change.

9
New cards

Blood Glucose Regulation

insulin + glucagon adjust blood glucose conc to maintain healthy supply of glucose.

10
New cards

Blood pH Regulation

Adjustments made to acid-base balance in blood to maintain optimum pH, preventing enzyme impairment.

11
New cards

Temperature Regulation

Adjustments like sweating or shivering maintain optimum temperature to prevent enzyme impairment.

12
New cards

Water Regulation

Water is removed or reabsorbed from blood/tissue fluid to maintain optimum water potential, preventing cell damage.

13
New cards

Positive Feedback Systems

Amplify changes rather than reversing them, leading to greater deviation from the optimum point.

14
New cards

How Positive Feedback Works

Initial change stimulates effectors, enhancing the change until an endpoint is met.

15
New cards

Blood Clotting

Clotting factors activate further clotting, demonstrating a positive feedback mechanism.

16
New cards

Childbirth

Oxytocin stimulates more uterine contractions, illustrating a positive feedback mechanism.

17
New cards

Cell Signalling

Process by which cells communicate, occurring between adjacent or distant cells.

18
New cards

Hormonal Communication

Hormones travel in blood to signal target cells that may be far away.

19
New cards

Cell-Surface Receptors

Allow cells to recognize and respond to hormones, facilitating communication.