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Unit 3: Heart, Lungs, and Life Questions
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An ova is usually fertilised in the ________.
uterus
Ova are made in the ________.
ovaries
Sperm leave the body through the ________.
urethra
Sperm are made in the ______.
testicles
How many sperm fuse with the ovum?
1
How many blood capillaries are there?
a lot (300 million)
How many cavities does the heart have?
4
How many bronchi do you have?
2
How many lungs do you have?
2
How does the embryo get the nutrients and oxygen it needs?
Through the umbilical cord
What are the four different names that the fusion of sperm and ovum receive through fertilisation, pregnancy, and birth?
zygote, embryo, foetus, baby
Where does fertilisation take place?
Fertilisation takes place inside the female body.
What two cells fuse in the process of fertilization?
The sperm and the ovum
How long does pregnancy last?
It lasts 40 weeks.
Carbon dioxide and waste substances leave the circulatory system through the _________.
capillaries
Oxygen and nutrients first enter the circulator system through the _________.
capillaries
________ connect the arteries and veins.
Blood capillaries
______ carry blood away from the heart.
Arteries
_______ carry blood towards the heart.
Veins
When we exhale, where does the air containing carbon dioxide go?
Air containing carbon dioxide is pushed out of the body.
When we inhale, where does the air containing oxygen go?
Air containing oxygen travels down the respiratory tract to the lungs.
What happens, when we exhale?
When we exhale, air leaves the body.
During respiration, what happens when we inhale?
When we inhale, air enters the body.


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