Question 3(e)
[Maximum number: 2]
When a body senses danger, more adrenaline is secreted from the adrenal glands.
Describe two ways in which the hormone adrenaline affects the body in preparation for action.
1
2
IGCSE Biology Extended 14.3.3—Adrenaline as the hormone secreted Topic Practice
14.3.3—Adrenaline as the hormone secreted
• Describe adrenaline as the hormone secreted in ‘fight or flight’ situations and its effects, limited to: (a) increased breathing rate (b) increased heart rate (c) increased pupil diameter
Question 3(e)
[Maximum number: 2]
When a body senses danger, more adrenaline is secreted from the adrenal glands.
Describe two ways in which the hormone adrenaline affects the body in preparation for action.
1
2
Question 3(d)(iii)
[Maximum number: 2]
Fig. 3.1 shows a section through a kidney.
Fig. 3.1
Testosterone is a steroid hormone that is also taken as a drug to improve sporting performance.
State why testosterone is taken by some people to improve sporting performance.
Question 3
Question 3(c)
(a)
Scientists investigated the effect of adrenaline on blood glucose concentration in rats.
The rats were put into two groups:
- group A was given an injection of adrenaline
- group B was given an injection that did not contain adrenaline.
The blood glucose concentrations of the rats in both groups were monitored for three hours after the injections.
The rats did not eat for 12 hours before the investigation or while they were being monitored.
The results are shown in Fig. 3.1.
Fig. 3.1
Key:
- group A (adrenaline)
- - - group B (no adrenaline)
[ 5 ]
Question 3(c)(ii)
(i)
Describe and explain the results shown in Fig. 3.1 for group A.
[ 5 ]
Question 3(e)
(b)
Describe two effects of adrenaline on the body, other than a change in blood glucose concentration.
1
2
[ 2 ]
Question 23
[Maximum number: 1]
Which row shows the effects of increased adrenaline release?
breathing rate
pulse rate
pupil
decreases
increases
widens
increases
decreases
widens
increases
increases
narrows
increases
increases
widens
Question 4(c)
[Maximum number: 4]
Complete Table 4.1 to describe the effects of the hormone released when a person is in a dangerous situation.
Table 4.1
Question 24
[Maximum number: 1]
What are the effects of adrenaline?
breathing rate
pulse rate
decreased
decreased
increased
increased
increased
no effect
no effect
increased
Question 24
[Maximum number: 1]
Four effects of a specific hormone are listed.
- increased blood pressure
- increased blood glucose concentration
- increased rate of respiration
- reduced blood flow to the gut
What is this hormone?
A
adrenaline
B
glucagon
C
insulin
D
testosterone
Question 24
[Maximum number: 1]
A student begins to lose control of her bicycle while travelling down a hill at speed.
The concentration of which substance will begin to increase rapidly in her blood?
A
adrenaline
B
insulin
C
oestrogen
D
testosterone
Question 24
[Maximum number: 1]
More adrenaline is produced by the adrenal glands when a person is frightened.
This increase affects several parts of the body.
Which rows are correct?
A
1 and 3
B
1 and 4
C
2 and 3
D
2 and 4