B5 - Homeostasis And Response

Question 1

What is the definition of the word homeostasis?

Answer 1

Maintaining a constant internal environment

Question 2

How does the body control internal conditions?

Answer 2

With automatic control systems

Question 3

What are the three key components of an automatic control system?

Answer 3

Receptors, coordinators, effectors

Question 4

What is the mechanism that the automatic control systems use to keep conditions normal?

Answer 4

Negative feedback

Question 5

What two systems does the body have to maintain homeostasis?

Answer 5

The nervous system and the endocrine system

Question 6

What is the proper term for something that happens outside of the body that the body needs to respond to?

Answer 6

A stimulus

Question 7

What are receptors?

Answer 7

Cells that detect stimuli

Question 8

What are effectors?

Answer 8

They are cells that receive nervous impulses and bring about a change

Question 9

What is the central nervous system (CNS)?

Answer 9

Brain and spinal cord

Question 10

What does the CNS do?

Answer 10

Coordinates a response based on the information it receives

Question 11

How are electrical impulses transported from receptors to the CNS?

Answer 11

By the sensory neurones

Question 12

How are electrical impulses transported from the CNS to the effectors?

Answer 12

By the motor neurones

Question 13

What are the two main types of effectors?

Answer 13

Muscles and glands

Question 14

What is a synapse?

Answer 14

A gap between the neurones

Question 15

How do electrical impulses travel across the synapses?

Answer 15

Chemicals are released and diffuse across the synapse and a new electrical impulse is set off

Question 16

What are reflexes?

Answer 16

Automatic responses that don’t involve the conscious part of the brain

Question 17

What is the passage of information in a reflex called?

Answer 17

The reflex arc

Question 18

Which parts of the CNS do reflex arcs pass through?

Answer 18

Subconscious parts of the brain and the spinal cord

Question 19

In a reflex arc, what does the information do instead of the CNS making a decision?

Answer 19

Passes through a relay neurone

Question 20

Are reflexes or usual responses faster?

Answer 20

Reflex

Question 21

Why are reflexes faster than normal responses?

Answer 21

Because the information doesn’t have to be considered, the brain doesn’t have to decide which signal to send along the motor neurone

Question 22

What does the cerebral cortex do?

Answer 22

Responsible for consciousness, intelligence, memory and language

Question 23

What does the medulla do?

Answer 23

Control subconscious activities

Question 24

What does the cerebellum do?

Answer 24

Responsible for muscle coordination