Topic 5 Homeostasis Flashcards
(142 cards)
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Liver
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Kidney
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An insect flies near a person’s eye. The person blinks. This is a reflex
action.
Figure 2 shows the coordination system for this reflex action.
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Describe how the brain receives information about light entering the eye.
You should include the names of structures in your answer 3
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Two students investigated the effect of drinking coffee on reaction time.
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Structure Q causes the change in size of the pupil.
Name structure Q.
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Explain why the mean for student B has been calculated incorrectly.
Use information from the table.
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Student C said the results from this investigation showed that he had the
fastest reactions.
Give two reasons why student C’s statement is not correct.
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2
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Suggest two ways the students could improve the method to make sure
the test would give valid results.
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Chemical diffuses across one neurone to the next
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Which gland is the pituitary gland?
A
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Which is the pancreas
D
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The hormone insulin helps to decrease the blood glucose concentration.
Insulin causes its target organs to take in glucose from the blood
Liver
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Glycogen
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Scientists investigated the effect of a glucose drink on the concentration of
glucose in a person’s blood.
This is the method used.
1. Take a small sample of blood from the person.
2. Measure the concentration of glucose in the person’s blood.
3. Give the person a drink containing 50 grams of glucose.
4. Measure the concentration of glucose in the person’s blood at intervals.
5. Calculate the change in blood glucose concentration from the starting
value.
Figure 2 shows the results
What is the time taken for the blood glucose concentration to decrease from
its highest value back to the starting value?
Use data from Figure 2 in your answer
30 mins
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What is the time taken for the blood glucose concentration to decrease from
its highest value back to the starting value?
Use data from Figure 2 in your answer.
___________________________________________________________
Time taken = _______________ minutes
(1)
(g) Why can you not be certain that your answer to part (f) is accurate?
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response / reaction
automatic or no thinking or not conscious or involuntary
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A woman’s hand accidentally touches a hot object.
The woman moves her hand away rapidly.
Describe how the woman’s nervous system coordinates the reflex action 6
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The endocrine system coordinates many internal functions of the body.
Give three ways coordination by the endocrine system is different from
coordination by the nervous system.
slower
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longer-lasting
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(chemical / hormone) via blood instead of electrical / impulse /
neurones
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Describe how hormones control the menstrual cycle.
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FSH (release from pituitary) stimulates maturation of egg / ovum /
follicle
oestrogen (release from ovary) inhibits FSH production and
stimulates LH production
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LH (release from pituitary) stimulates ovulation
allow LH stimulates release of egg
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progesterone (release from ovary) inhibits FSH and LH production
allow (release from corpus luteum)
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oestrogen and progesterone maintain the uterus lining
allow oestrogen and progesterone build
up the uterus lining
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People with kidney failure can have dialysis or a kidney transplant.
Dialysis is often needed 3 times each week and can take over 4 hours
each time.
Dialysis usually happens in a hospital.
Kidney transplants require a donor and major surgery.
Describe the advantages and disadvantages of having a kidney transplant
instead of having dialysis.4
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Protein
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Protein
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How many dialysis sessions did person A have each week?
3
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What happens to the concentration of urea in the blood between dialysis
sessions?
Increases
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Give two reasons why a kidney transplant is a better method for treating
kidney disease than dialysis
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ADH
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high(er) concentration of blood causes (more) ADH / hormone
release
(and hormone / ADH causes) increased permeability of kidney
tubules (to water)
(so) increased water reabsorption
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no information about control variables or named e.g.
• concentration of drugs not given / may differ
• so results may not be valid
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On which day is fertilisation most likely to occur?
Use information from the graph above
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A
Rapid rise or fastest
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In each dish the seedlings compete with each other.
Give two factors the seedlings compete for
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Auxin
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Explain what happened to the growth of the seedling on side Q compared
with the growth on side P.
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Gravitropism
Gravity
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Plan an investigation to show the effect of light from one direction on the
growth of plant seedlings.
Include details of any controls needed.
You may use some of the equipment shown in Figure 1 and any other
laboratory apparatus.
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leaves / plant receive(s) / absorb(s) more light
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(so) more photosynthesis
(so plant) produces more glucose
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What is the purpose of the aluminium foil?
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