B10

Question 1

How does your body eliminate excess water?

Answer 1

-Sweat
-Removed in urine by kidneys

Question 2

Why is it important for the body to maintain constant internal conditions?

Answer 2

For optimal enzymic activity and cell functions

Question 3

What is a stimulus?

Answer 3

A change in the environment, causing a biological reaction

Question 4

What region of the brain in concerned with consciousness, intelligence, memory and language?

Answer 4

Cerebral cortex

Question 5

What is the role of the medulla?

Answer 5

Controls unconscious activities, such as heart beat and breathing

Question 6

How have scientists managed to map different regions of the brain to their respective functions?

Answer 6

By:
-Electrically stimulating different areas of the brain
-Using MRI to monitor brain activity after injury or while performing a certain task

Question 7

What parts of the eye control the shape of the lens?

Answer 7

The ciliary muscles and suspensory ligaments

Question 8

What happens to the human eye in a bright light?

Answer 8

The circular muscles contract and the radial muscles relax, causing the pupil to constrict

Question 9

How can sight defects be treated?

Answer 9

Using:
-Spectacle lenses
-Contact lenses
-Laser surgery
-Replacement lens

Question 10

What type of lens is used to correct myopia?

Answer 10

Concave lens

Question 11

Describe how the ciliary muscles and suspensory ligaments enable you to see a nearby object

Answer 11

-the ciliary muscles contract and decrease diameter
-so the suspensory ligaments slacken
-the lens becomes rounder and can refract light more
-to project a clear image onto the retina

Question 12

What is the function of the iris?

Answer 12

Controls the size of the pupil