Principles of Homeostasis

Principles of Homeostasis Principles of Homeostasis - Start

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Principles of Homeostasis




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Presentations text content in Principles of Homeostasis

Slide1

Principles of Homeostasis

12.1

Slide2

Learning Objectives

Define homeostasis

Explain the importance of homeostasis

Describe how control mechanisms work

Explain how control mechanisms are co-ordinated

Success Criteria

You can define homeostasis and suggest what things need to be maintained in the body

You can create a mind map of ideas for why homeostasis is important

You can take notes on control mechanisms

You can answer an exam question on homeostasis

Slide3

Starter

What is homeostasis?

The maintenance of a constant internal environment

What things need to be maintained?

Temperature

Oxygen levels

Water levels

Tissue Fluid

Composition of blood

Slide4

Why is homeostasis important?

Enzymes

: sensitive to pH and temperature changes. Big changes could cause denaturation and stop reactions occurring.

Water Potential

: changing this in blood/tissue fluid could make cells shrink or even burst. Would prevent cells operating normally.

Blood glucose

: essential to maintain this to maintain water potential and also give cells a constant supply of glucose for respiration.

Independence

: Stops organisms being reliant on the external environment (wider choices of where to live etc.)

Slide5

Control Mechanisms

Stages of Homeostatic Control

The

S

et Point

(the norm)

Receptor

(detects variations)

Controller

(co-ordinates info and sends instructions)

Effector

(brings about changes)

Feedback Loop

(tells receptor about the changes)

Slide6

Control Mechanisms

Receptors

Detect the change

Control Centre

Coordination

Effector

Have an effect on the system

Output

Rise in some parameter

Input Fall in some parameter

Slide7

Analysing Info from Receptors

Changes can be detected by a number of different receptors

This gives the brain a better picture of what is being altered

Allows a more informed response to be made

Slide8

Plenary – Exam Q

How does maintaining a constant body temperature allow metabolic reactions in cells to proceed with maximum efficiency

?

(5)

Slide9

Plenary – Exam Q ANSWERS

1

. Body temp./37°C is optimum temp for enzymes;

2. excess heat denatures enzymes/alters tertiary structure/alters

shape of active site/enzyme;

3. substrate cannot bind/

eq

,;

4. reactions cease/slowed;

5. too little reduces kinetic energy of

molecules / molecules

move more slowly;

6. fewer collisions/fewer ES complexes formed’

max 5

Slide10

Learning Objectives

Define homeostasis

Explain the importance of homeostasis

Describe how control mechanisms work

Explain how control mechanisms are co-ordinated

Success Criteria

You can define homeostasis and suggest what things need to be maintained in the body

You can create a mind map of ideas for why homeostasis is important

You can take notes on control mechanisms

You can answer an exam question on homeostasis

Slide11


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