Homeostasis

Question 1

What is homeostasis?

Answer 1

Homeostasis is the regulation of internal conditions in your body to maintain ‘OPTIMAL’ function

Question 2

Name 2 automatic control systems

Answer 2

-Central nervous system (CNS)
-Endocrine system

Question 3

What does the CNS control?

Answer 3

It controls voluntary and involuntary actions
(caused by electrical impulses to external stimuli)

Question 4

What is the Endocrine system?

Answer 4

Glands (organs) that produce CHEMICAL messages (hormones) in response to INTERNAL/EXTERNAL stimuli

Question 5

What is a stimulus?

Answer 5

A change in your environment that you need to react to

Question 6

What can a stimulus trigger?

Answer 6

CNS or ENDOCRINE system

Question 7

What is the CNS made of?

Answer 7

Brain and Spinal Cord

Question 8

In the Central Nervous System, what does the brain do?

Answer 8

Contains parts of the CNS (command centre)

Question 9

In the Central Nervous System, what is the spinal cord?

Answer 9

reflex arch

Question 10

What do sensory nerves do?

Answer 10

Carry information from senses

Question 11

What do motor nerves do?

Answer 11

send signals to muscles from brain/spinal cord

Question 12

Where is the pituitary and hypothalamus?

Answer 12

the brain

Question 13

What is the order of reaction to stimuli?

Answer 13

-Stimulus
-Receptor
-Sensory neuron
-CNS
-Motor neuron
-Effector (muscle)
-Response

Question 14

What is Hyperthermia?

Answer 14

Medical emergency where the body fails to regulate temperature

Question 15

What is Hypothermia?

Answer 15

abnormal condition where the body loses too much heat

Question 16

Methods of control (TEMPERATURE)

Answer 16

body/skin regulate its internal temperature

Question 17

Methods of control (BLOOD SUGAR)

Answer 17

has to be kept constant
Organs: liver and pancreas

Question 18

Methods of control (WATER LEVELS)

Answer 18

regulated and kept in balance
Organs: Kidneys

Question 19

Methods of control (BODY PH)

Answer 19

needs to be roughly 7.4
Organs: Kidneys - shed excess ions

Question 20

Methods of control (OXYGEN/CARBON DIOXIDE LEVELS)

Answer 20

Concentration in the blood needs to be regulated
Organs: lungs and heart

Question 21

Whats the name of a neurone that takes an impulse to the brain+spinal cord?

Answer 21

Sensory neurone

Question 22

Where do electrical impulses go when they’re inside your CNS?

Answer 22

Passed along relay neurones

Question 23

The impulse is passed from your brain+spinal cord to your…

Answer 23

muscles/glands along motor neurones

Question 24

What is reaction time?

Answer 24

The time it takes to react to a stimulus

Question 25

What is the Cerebrum (Cerebral cortex) responsible for?

Answer 25

It’s the largest part. Higher thinking skills eg memory, language, conscious thought, decision making

Question 26

What is the cerebellum responsible for?

Answer 26

Coordination, balance and voluntary muscle function eg walking, lifting

Question 27

What is the Medulla responsible for?

Answer 27

Involuntary (automatic) body function ad processes eg breathing, heart rate

Question 28

What are neurones?

Answer 28

Neurones are specialized cells that conduct electrical impulses through the body

Question 29

Why does the body have a reflex response?

Answer 29

To PROTECT the body from harm/damage

Question 30

What is the THERMOREGULATORY CENTRE?

Answer 30

body TEMPERATURE control

Question 31

What is VASODILATION?

Answer 31

It occurs during the body’s response to hot temperatures. (When blood vessels dilate)

Question 32

What is VASOCONSTRICTION?

Answer 32

It occurs during the body’s response to cold temperatures. Blood vessels constrict

Question 33

What organs involve the regulation of glucose?