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Unit 3: Heart, Lungs, and Life Vocabulary
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The embryo is attached to the placenta by the _________.
umbilical cord
The _______ develops in the uterus. It provides nutrients and oxygen to the embryo.
placenta
After the zygote is formed, it implants in the wall of the uterus. At this stage, it is called an ______.
embryo
The _______ is connected to the testicles. It contains the urethra. The sperm pass through the urethra and are expelled out of the body.
penis
The _______ covers and protects the testicles.
scrotum
The ______ are two oval shaped glads. They produce sperm.
testicles
The _______ is the part that can be seen on the outside of the body. It surrounds and protects the entrance to the vagina.
vulva
The _______ connects the uterus to the outside of the body.
vagina
The _______ is a hollow organ with muscular walls. It expands during pregnancy to contain the growing ________.
uterus, foetus
Two ______ produce the female reproductive cells (ova).
ovaries
The female cell in reproduction.
ovum
The male cell in reproduction
sperm
A _______ is created when a male cell fuses with a female cell.
zygote
__________ are the smallest type of blood vessel. They connect the veins and the arteries.
Blood capillaries
_______ take blood to the heart.
Veins
_______ take blood from the heart to the rest of the body.
Arteries
_______ collects, transports and releases gases, nutrients and waste products around the body.
Blood
The heart pumps blood around the body through __________.
blood vessels
The central organ in the circulatory system is the _________.
heart
Underneath the lungs there is a muscle called the __________.
diaphragm
At the end of the bronchioles, there are tiny air sacs, called ________. They are surrounded by blood capillaries.
alveoli
Inside the lungs, the bronchi divide into smaller tubes called ___________.
bronchioles
At the end of the trachea, two small tubes, called _______, connect to the ________.
bronchi, lungs
The respiratory tract runs from the neck to the chest. It contains the __________, larynx, and trachea.
pharynx
Air, entering the body through the mouth and ______, travels to the neck
nostrils
When we breath in, air travels down tubes called the __________ to the lungs.
respiratory tract