Homeostasis and the nervous system

Question 1

what is the role of a receptor

Answer 1

to detect a stimulus

Question 2

why does the body need to maintain optimal conditions

Answer 2

for optimal enzyme action and cell function

Question 3

what’s the difference between internal conditions and external conditions

Answer 3

internal- refers to conditions inside the body e.g body temp

external- refers to conditions outside the body e.g room temp

Question 4

what is the role of a coordination centre

Answer 4

receives and processes the information from receptors then organises a response

Question 5

what is the role of an effector

Answer 5

detect stimuli (changes in the environment)

Question 6

what is a homeostasis

Answer 6

the regulation of conditions inside the body to maintain a stable and internal environment,
- in response to changes in both internal and external conditions

Question 7

name the homeostatic control mechanisms

Answer 7

-receptors
-coordination
-effectors

Question 8

what are the 2types of effectors and what do they do when stimulated

Answer 8

muscles- contract
glands- release hormones

Question 9

what is negative feedback

Answer 9

a mechanism that restores a level back to optimum in a system

Question 10

what are the key differences between the nervous system and the endocrine system

Question 11

Name 2 internal conditions

Answer 11

-blood glucose concentration
-blood pH

Question 12

Name 2 external conditions

Answer 12

-room temp
-amount of fluid you drink

Question 13

Homeostasis relies on automatic control systems.

In what order are signals passed along the control system?

Answer 13

receptor➔ coordination centre ➔ effector

Question 14

where are the coordination centres located in the body

Answer 14

-spinal cord
-brain

Question 15

what passes along nerve cells

Answer 15

electrical impulses

Question 15

homeostatis relies on …..

Answer 15

negative feedback
for when the levels of something get too high theyre brought back down, and when something get too low theyre brought back up

Question 15

If our body temperature gets too high, negative feedback will cause our temperature to

Answer 15

decrease back down

Question 15

what is the purpose of the nervous system

Answer 15

to detect changes in the environment (stimuli) and to coordinate responses

Question 15

Name 4 different parts of a nervous system

Answer 15

-Central Nervous System
-Sensory neurones
-motor neurones
-effectors

Question 16

what is the Central Nervous System composed of

Answer 16

-brain
-spinal cord
connected to the body by sensory and motor neurones

Question 17

what is the gap between two neurone called

Answer 17

synapse

Question 18

whats released across a synapse

Answer 18

chemicals

Question 19

what is the sensory neurone

Answer 19

-the neurones that carry information as electrical impulses from the receptors to the CNS

Question 20

whats a motor neurone

Answer 20

-neurones that carry electrical impulses from the CNS to effectors

Question 21

what are 2 receptors

Answer 21

-taste on the tongue
-sound in the ears

Question 22

what does the central nervous system do

Answer 22

it receives infomation from the receptors and then coordinates a response

Question 23

What does Homeostasis control?

Answer 23

-Blood glucose concentration
-body temperature
-water levels.

Question 24

reflex actions control what

Answer 24

everyday bodily functions
e.g breathing and digestion

Question 25

state the reflex pathway

Answer 25

stimulus—- receptor—– sensory neurone—– relay neurone—- motor neurone—- effector—- response

Question 26

What are reflexes?

Answer 26

Automatic and rapid reactions which don’t involve conscious parts of the brain. Involve sensory, relay and motor neurones. Control breathing, digestion, avoiding danger

Question 27

What is the endocrine system?

Answer 27

Glands that secrete chemicals called hormones directly into the bloodstream. Blood carries the hormone to a target organ where it produces an effect. Slower but longer lasting

Question 28

What is the pituitary gland?

Answer 28

Master gland which secretes several hormones into the blood.