What is the function of the iris?
To detect light.
To focus light onto the retina.
To control how much light entersthe pupil.
What is the central nervous system madeup of?
The brain and receptors
The brain and the spinal cord
The spinal cord and receptors
Which is the correct pathway for stimulialong a reflex arc?
relay neurone -> sensory neurone>motor neurone
sensoryneurone ->motor neutone->relay neurone
sensory neurone >relay neurone->motor neurone
Which hormone controls the 'fight or fightresponse?
Adrenaline
Oestrogen
Insulin
What is the role of effectors in producing coordinated response?
To produce stimuli.
To detect stimuli.
To bring about a response to stimuli.
How do blood vessels supplying the skin change when body temperature gets too low?
They constrict
They dilate
Insulin is secreted by which organ?
Liver
Pancreas
Adrenal glands
In order to cool the body down, sweatglands..
produce less sweat.
produee more sweat
absorb sweat
True or False? "Hormones havelonger-lasting effects than nervous impulses,"
True
False
Within the eye, the lens is responsible for..
...controlling the diameter of the pupil.
... focusing light onto the retina.
... carrying impulses to the brain.
A rellex arc...
... only involves the brain.
... only involves the conscious part ofthe brain.
... doesn't involve the conscious part ofthe brain.
Which of the following hormones isproduced in the ovaries?
oestrogcn
FSH
Adrenaline
What happens at the start of mitosis?
The cytoplasm divides.
The arms ofthe chromosomes are pulledto opposite ends of the cell.
The chromosomes are duplicated.
In what type of reproduction do gametes fuse together?
Asexual
Sexual
During pregnaney, what chance is there of a woman having a baby boy?
50%
25%
75%
If a cell is diploid, how many copies of eachchromosome does it have?
One
Two
Four
How many chromosomes does a humanhaploid cell have?
46
23
92
True or False? “mitosis results in two cellsthat are genetically different.
T
F
Protein synthesistakes place on which ofthe followingorganelles?
Ribosomes
Mitochondria
Chloroplasts
True or False? “Some gametes aregenetically identical to each other.
True
False
Which hormone promotes the developmentof female secondary sexual characteristics?
Progesterone
Testosterone
Oestrogen
Which type of cell division producesgametes?
Meiosis
Mitosis
What is a fertilised egg cell also known as?
A zygote
A gamete
A daughter cell
What is one role of oestrogen in themenstrual cycle?
To inhibit the release of LH.
To cause the lining of the uterusto grow
To cause an egg to mature in oneof the ovaries.
Which of the following allows the exchangeof food, oxygen and waste between the bloodof the mother and the blood of the embryo?
Amniotic fuid
Wall of the uterus
Placenta