Homeostasis

Question 0

What is a hormone?

Answer 0

Chemical regulators. Chemical signalling molecules

Question 1

What is the CNS?

Answer 1

The central nervous system. The spinal cord, and the brain.

Question 2

What is the control centre? And what does it do?

Answer 2

The brain and the spinal-cord. Makes decisions and processes info.

Question 3

What is the inter-sensory neuron?

Answer 3

The neuron thats in between the motor and the sensory neuron

At the spinal area

Question 4

What is homeostasis?

Answer 4

organisms maintain a relatively stable internal body system or environment for body cells between narrow limits

Question 5

What are two key points of homeostasis?

Answer 5

Organisms maintaining a stable environment between narrow limits

Question 6

What are four examples of homeostasis?

Answer 6

Body temperature BP and volume pH and the amount of components in the blood, glucose levels in blood, water levels in blood, blood pressure, level of CO2

Question 7

What are dendrites?

Answer 7

Receptors that receive signals from other neurons

Question 8

Where are dendrites located and what do they look like?

Answer 8

They are located at the beginning of the neuron and they are the branchy parts.

Question 9

What does the axon terminal button do?

Answer 9

Sends the electrical impulse to other neurons

Question 10

Where is the Axon terminal button located?

Answer 10

At the end of the neuron and it looks like branches

Question 11

What does the cell body do?

Answer 11

Coordinates functions

Question 12

What does the nucleus do?

Answer 12

It is the control centre of the nerve cell

Question 13

What is the myelin sheath?

Answer 13

It is the thing that protects the axon and insulates it ensuring that it has a rapid transmission of the electrical impulse

Question 14

What is the axon?

Answer 14

Part of the neuron that transmits the electrical impulse and has the myelin sheath surrounding it

Question 15

What is the stimulus?

Answer 15

A change in the external or internal enviroment

Question 16

What is an example of a stimulus?

Answer 16

A decrease in body temperature

Question 17

What is a receptor?

Answer 17

Cell or tissue that detects the change in the environment eg change in temperature

Question 18

What is a sensory neuron?

Answer 18

It senses, example, it feels the heat when you touch the hotplates.
Carrys messages from receptors to the central nervous system

Question 19

What is the central nervous system?

Answer 19

The spinal-cord and the brain that receive messages from the sensory neuron

Question 20

What is the brain?

Answer 20

The inter neuron. That’s in between the motor and the sensory neuron at the spinal area

Question 21

What is the motor neuron?

Answer 21

Receive messages from the brain to muscles and tissues. Takes messages from the brain to the effector

Question 22

What is the response?

Answer 22

How the body reacts to the stimulus, which was that problem at the beginning, example the decrease in body temperature. Sorry, the respondent would shiver because the body temp was cold, too warm it up.

Question 23

What is the path of the stimulus?

Answer 23

The stimulus, to the receptor, to the sensory neuron, to the brain, to the spinal cord which is also the central nervous system, to the motor neurone to the effector and to the response.

Question 24

What are the main comparisons of the endocrine and the nervous systems?

Answer 24

The endocrine system is slower longer lasting, it has hormones in it, it doesn't have electrical but it has chemical signals involved and the type of organisms that have it are plants and animals. While, the nervous system is very fast, it doesn't have a long duration, it doesn't have hormones involved, it has electrical and chemical signals involved and only animals have it.

Question 25

How is the impulse transmitted from one neuron to another?

Answer 25

The electrical impulse leaves the axon terminal and goes through the synapse and the synapse is a chemical impulse so the electrical impulse changes to a chemical impulse when it is passing through the synapse. Neurotransmitters go through the synapse and the go into the receptor from the next neuron which they then immediately turn into an electrical impulse.

Question 26

What is the reflex arc?

Answer 26

A rapid response to prevent harm, examples; blinking, sneezing and touching a hot plate. There is a stimulus and then the response (sensory neuron) is carried to the spinal cord (inter neuron) then it's taken from here by the motor neuron to the effector. It doesn't go to the brain. So this makes the reaction very fast. The brain still gets the message but after you've moved from the pain

Question 27

What is positive feedback?

Answer 27

Is a positive response to the stimulus, it reinforces what is happening, it helps the situation.

Question 28

What is an example of positive feedback?

Answer 28

When a mothers giving birth she pushes her baby and signals are sent to the brain and the brain sends back; more pushing

Question 29

What is negative feedback?

Answer 29

When the response counteracts the stimulus. So when something is too high the negative feedback will make it go lower or vice versa. It goes against the stimulus

Question 30

What is an example of negative feedback?

Answer 30

Shivering when your body is cold to warm it up, or sweating when your body is hot to cool it down.

Question 31

What are the four types of receptors?

Answer 31

Chemo Thermo Mechano Photo

Question 32

What does a chemo receptor detect?

Answer 32

Detects chemical eg nose, stomach and tongue

Question 33

What does a thermo receptor detect?

Answer 33

The temperature eg skin

Question 34

What does a mechano receptor detect?

Answer 34

Touch eg ears detect balance

Question 35

What does a photo receptor detect?

Answer 35

Light eg eyes

Question 36

What is the circulatory system?

Answer 36

Distributes oxygen and nutrients (air sac) heart pumps it around

Question 37

What is the respiratory system?

Answer 37

Oxygen in, carbon dioxide out, (breathing) mouth to alveoli

Question 38

What is the name given to the process that returns the temperature to within the normal range to help maintain homeostasis?

Answer 38

Negative feedback

Question 39

What is the reflex arcs control centre?

Answer 39

The spinal cord

Question 40

What is the purpose of the reflex arc?

Answer 40

To keep you safe, and to prevent your body from being harmed.

Question 41

What nerve cells are involved in a reflex arc?

Answer 41

Sensory, Inter and motor.

Question 42

Why are hormones involved in the reflex arc?

Answer 42

Because they are too slow for the procedure to prevent harm

Question 43

What is the order of names of things in a response?

Answer 43

``` Receptor Sensory neuron Inter neuron Effector Synapse Neurotransmitters ```