B10 - The Human Nervous System

Question 1

What are coordination centres?

Answer 1

Areas that receive and process information from receptors. They send out signals and coordinate the response of the body

Question 2

What are effectors?

Answer 2

Areas (usually muscles or glands) that bring about responses to the stimulus that has been received. These responses restore conditions in the body to the optimum level

Question 3

What is homeostasis?

Answer 3

The regulation of the internal conditions of a cell or organism to maintain optimum conditions for function and enzyme action, in response to internal and external changes

Question 4

What is a nerve?

Answer 4

A bundle of hundreds or even thousands of neurones

Question 5

What are receptors?

Answer 5

Cells that detect stimuli - changes in the internal or external environment

Question 6

What is stimuli?

Answer 6

Changes in the external or internal environment that can be detected by receptors

Question 7

Name some example conditions controlled by homeostasis:

Answer 7

°Internal body temperature (must be 37°C)°Blood PH (must stay within 7.2 and 7.4)°Osmotic balance°Blood glucose concentration

Question 8

What are metabolic reaction

Answer 8

Any reaction that happens with an organism

Question 9

What type of system is thermoregulation?

Answer 9

negative feedback system

Question 10

What is a negative feedback cycle?

Answer 10

A system which works to maintain a steady state, if a factor in the internal environment increases changes take place to reduce it and restore it to its original level, and if a factor in the internal environment decreases changes take place to increase it and restore it to its original level