B5

Question 1

What’sa reaction time in a stimulus

Answer 1

How long it takes to respond

Question 2

How are nerve signals transferred across a synapses

Answer 2

Chemicals diffuse across the synapses to set of new electrical impulses

Question 3

What is a reflex arc

Answer 3

The passage of information in a reflex ( from receptor to effector )

Question 4

Reflexes do not involve conscious parts of the brain . Why is this advantageous?

Answer 4

It means that reflexes can be rapid and automatic

Question 5

What is homeostasis?

Answer 5

To maintain a stable internal environment, in response to changes in both internal and external condition

Question 6

Give two other conditions that are controlled by homeostasis

Answer 6

E.g blood glucose level and body temperature

Question 7

What components do all control systems include?

Answer 7

Receptors,a coordination centre and effectors

Question 8

Why is negative feedback important

Answer 8

Help to maintain a stable internal environment

Question 9

What does central nervous system consist of?

Answer 9

The brain and spinal cord

Question 10

Which type of neurone carries impulses from the CNS to effectors?

Answer 10

Motor neurone

Question 11

Why is the nervous system important in humans ?

Answer 11

The nervous system means that humans can react to their surroundings and coordinate their behaviour

Question 12

How is the stimulus transmitted from receptors that to the CNS?

Answer 12

Sensory neurones carry the information from the receptors to the CNS

Question 13

What is the cerebellum responsible for?

Answer 13

Muscle coordination

Question 14

Give two things that the medulla controls?

Answer 14

It controls unconscious activities, such as breathing and heart rate

Question 15

Suggest a part of the brain that Alzheimer’s disease affects ?

Answer 15

E.g the cerebral cortex (this part of the brain is responsible. For memory and language )

Question 16

Why is it so difficult to study and treat the brain?

Answer 16

The brain is really complex and delicate

Question 17

Give three new technologies used to treat vision defects ?

Answer 17

Contact lenses, laser eye surgery and replacement lens surgery

Question 18

What is the thermoregulatory centre located ?

Answer 18

In the brain

Question 19

Where are the receptors that detect the temperature. Of the blood located ?

Answer 19

In the thermoregulatory centre

Question 20

How are hormones transported around the body ?

Answer 20

In the blood

Question 21

Which gland monitors and controls blood glucose concentration?

Answer 21

Pancreas

Question 22

Which plant hormones is used to grow cells in tissue cellular

Answer 22

Auxin

Question 23

What does dormant mean

Answer 23

Seed won’t grow until it’s been through certain conditions

Question 24

How could a farmer use plant hormones to kill weed without killing the plant

Answer 24

Auxin, would only affect the weed causing them to die

Question 25

How can the plant be improved growing

Answer 25

Rooting powder that contains auxin so the ends are cut and will produce rapidly

Question 26

Name the hormon that stimulates sperm production

Answer 26

Testosterone

Question 27

What term is used to describe the release of an egg from an overt?

Answer 27

Ovulation

Question 28

Describe how hormones control the growth and release of an egg

Answer 28

Follicle - stimulating hormone causes an egg to mature in a follicle in one of the ovaries luteinising hormone then stimulates the release of a matured egg at day 14(ovulation).

Question 29

Describe the uterus changes between 1 -4 days

Answer 29

Oestrogen takes place.
Hormone causes lining to grow between 4 and 14 days
Towards 14- stimulates to form LH and inhibits FSH

Question 30

WHats LH

Answer 30

LH stimulates the release of an egg

Question 31

What’s an FSH

Answer 31

FSH stops another egg from maturing during the money cycle

Question 32

Give one example of a non-hormonal method of contraception?

Answer 32

E.g. condom, female condom , diaphragm , spermicide , sterilisation , or abstinence

Question 33

Which hormone does the contraceptive injection contain?

Answer 33

Progesterone

Question 34

Give one ethical reason why somebody might disagree with the use of IVF

Answer 34

They might think that it is unethical to destroy extra embryos that are not used

Question 35

Give one advantage and disadvantage of IVF

Answer 35

Advantage: an infertile couple is able to have a child

Disadvantage : can lead to multiply birth , mentally or physically stressful

Question 36

Give three examples of substances that are removed from the body in urine

Answer 36

Excess water , ions and urea.

Question 37

What happens in the kidneys during filtration ?

Answer 37

Substances are filtered out of the blood as it passes through the kidneys

Question 38

Name two molecules that are absorbed back into the blood during selective reabsorption

Answer 38

E.g glucose and water

Question 39

Suggest two reasons why you might lose more water from the body during exercise

Answer 39

Water will be lost from the skin in sweat and when you breathe heavily more water will be lost from the lungs

Question 40

Explain how the liver and kidneys respond to eating foods high in protein

Answer 40

It produces ammonia as a waste product . Ammonia is toxic so it’s converted to urea in the liver . Urea is then transported to the kidneys where it filtered out of the blood and excreted from the body in urine