Homeostasis

Homeostasis

and the Nervous System

Multiple Choice

What should your normal body temperature be?

• 25^oC

• 35^oC

• 37^oC

• 48^oC

Multiple Choice

What type of specialised cell transmits electric impulses around your body?

• Red blood cells

• Root hair cells

• Neurone

• Epithelial cell

Multiple Choice

Which organ in your body is part of your central nervous system?

• Heart

• Kidney

• Lungs

• Brain

Multiple Choice

How long is the average menstrual cycle?

• 5 days

• 28 days

• 45 days

• 108 days

Open Ended

Name as many hormones in the body as you can!

Learning Objectives

• Define what homeostasis is

• Give examples of conditions we need to keep the same

• Describing the structure of the nervous system

Open Ended

What do you think the word 'homeostasis' means? What words can you think of associated with it?

Conditions Inside

Human beings live everywhere from the equator to the Antarctic

People survive wearing no clothes or lots of clothes, running a marathon or sitting in front of a computer screen

Conditions can change dramatically around us and inside us yet we survive – how?

Our bodies respond to the changing environment!

Homeostasis

Homeostasis – the control of a constant environment in the body

In order for our bodies to work correctly, the conditions inside must be kept the same

Enzymes only work at their best in specific conditions of temperature and pH

Enzymes control all the functions of a cell – so for survival of tissues, organs and organisms the conditions must be perfect

What things do we need to keep the same in our bodies?

Open Ended

What do we need to kee the same in our bodies?

Keeping things the same...

• Temperature

• Water

• Sugar (glucose)

• Salts

• Carbon dioxide

• Oxygen

Multiple Choice

Homeostasis is...

• staying the same

• the control of a constant environment in the body

• staying at home

• the control of the constant environment outside the body

Nervous System

Your nervous system is made up of:

Brain             

Spinal cord  - these make up the Central Nervous System (CNS)

Nerves (made of nerve cells called neurones)

This is what your nervous system actually looks like!

Active Reading

The nervous system enables humans to react to their surroundings and to coordinate their behaviour.

A stimulus is any change in the surroundings. These are detected by receptors (cells that detect a change) and information passes along cells (neurones) as electrical impulses to the central nervous system (CNS).

The CNS is made up of the brain and spinal cord.

The CNS coordinates the response of effectors which may be muscles contracting or glands secreting hormones.

Multiple Choice

What are the parts of the CNS?

• Brain

• Brain, spinal cord and nerves

• Nerves and spinal cord

• Brain and spinal cord

Fill in the Blank

A stimulus is a __________ in the surroundings.

Multiple Choice

What type of cells detect a change in the environment?

• Stimulus

• Effector

• Muscle

• Receptor

Multiple Select

Which conditions do we need to keep the same in the body?

• Temperature

• Weight

• Water

• Sugar

• Hair colour

Fill in the Blank

Name one stimulus detected by the skin?

There are three type of nerve cell (neurone) in the body

Multiple Choice

Which type of nerve cell takes signals from the receptor to the CNS?

• Sensory

• Relay

• Motor

Multiple Choice

Which type of nerve cell carries impulses around the CNS?

• Motor

• Sensory

• Relay

Fill in the Blank

An example of an effector is a __________

Multiple Choice

Which type of neurone (nerve cell) carries impulses from the CNS to an effector (a muscle or gland)?

• Relay

• Motor

• Sensory

Poll

Well done! How are you feeling about this topic now?

• I've got it!!

• Pretty good, I understand it

• I need a little more time to go through it

• I don't understand it at all!