homeostasis and response

Question 1

What happens if our internal conditions aren’t at optimal levels?

Answer 1

Our enzymes denature and we have slower metabolic reactions.

Question 2

What are the conditions we control in our body?

Answer 2

Temperature
Urea
Water
Blood sugar
Carbon dioxide.

Question 3

What receives and processes information in the control system?

Answer 3

Coordination centre .

Question 4

Whats the function of stimulus?

Answer 4

This causes change in the body’s state.

Question 5

What does a receptor do?

Answer 5

This detects change and relays the information to the central nervous system.

Question 6

What does the CNS do?(Central Nervous System?)

Answer 6

This coordinates a response through the use of effectors (Muscles or glands) which work to return the conditions to normal.

Question 7

What is homeostasis?

Answer 7

Homeostasis describes all of the processes of a cell or and organism that work to keep optimal conditions in response to internal and external changes in the environment.

Question 8

Why is homeostasis necessary?

Answer 8

Because humans are organisms that live in a changing environment and therefore need to adapt.

Question 9

What are effectors?

Answer 9

Effectors are muscles or glands that act in response to a change in the internal or external environment.

Question 10

What do neurones do?(nerve cells)

Answer 10

They carry electrical impulses between receptors, the CNS and effectors.

Question 11

How many parts make up the CNS?

Answer 11

The CNS is made up of 3 parts.

Question 12

What are synapses?

Answer 12

Synapses are gaps between neurones.

Question 13

What do neurotransmitters do?

Answer 13

Neurotransmitters diffuse across the synapse and they bind to receptors on the next neurone.

Question 14

What triggers the release of neurotransmitters at a synapse in the brain?

Answer 14

An electrical impulse.

Question 15

Why are reflex actions important?

Answer 15

They let us react to dangerous situations quickly and automatically.

Question 16

What are the components of a reflex arc?

Answer 16

Stimulus, receptor, neurones, effector and response.

Question 17

Which part of a reflex arc carries the signal to the CNS?

Answer 17

The Sensory Neurone

Question 18

Whats a receptor?

Answer 18

These are found all over the body, and detect change and initiate a signaling process within the body.

Question 19

How can we investigate human reaction time?

Answer 19

By dropping a ruler and recording the length it was caught at.

Question 20

Which factors can effect human reaction time?

Answer 20

Caffeine and exercise.

Question 21

Examples of reflex action.

Answer 21

Sneezing,
Blinking,
Knee jerk response,
Dropping hot objects.

Question 22

Whats the brain made up of?

Answer 22

Millions of interconnecting neurones.

Question 23

Whats the medulla responsible for?

Answer 23

Unconscious activities such as breathing and heartbeat.

Question 24

Whats the cerebellum responsible for?

Answer 24

Muscle coordination.

Question 25

What is the cerebral cortex responsible for?

Answer 25

Conscious thought, such as memory, language and intelligence.

Question 26

How many main parts make up the brain?

Answer 26

Three. (Cerebellum, cerebral cortex and medulla)

Question 27

What does MRI stand for?

Answer 27

Magnetic Resonance Imaging.

Question 28

Whats the use of an MRI scan?

Answer 28

To allow us to learn which areas of the brain are active during different activities.

Question 29

Whats the name of a scientist that studies the brain?

Answer 29

A Neuroscientist.