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Unit 3: Heart, Lungs, and Life Vocabulary

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  • When we breath in, air travels down tubes called the __________ to the lungs.
    respiratory tract
  • 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
  • __________ are the smallest type of blood vessel. They connect the veins and the arteries.
    Blood capillaries
  • _______ take blood from the heart to the rest of the body.
    Arteries
  • The central organ in the circulatory system is the _________.
    heart
  • _______ collects, transports and releases gases, nutrients and waste products around the body.
    Blood
  • The _______ connects the uterus to the outside of the body.
    vagina
  • The respiratory tract runs from the neck to the chest. It contains the __________, larynx, and trachea.
    pharynx
  • The ______ are two oval shaped glads. They produce sperm.
    testicles
  • Air, entering the body through the mouth and ______, travels to the neck
    nostrils
  • 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 _______ covers and protects the testicles.
    scrotum
  • The male cell in reproduction
    sperm
  • Underneath the lungs there is a muscle called the __________.
    diaphragm
  • Two ______ produce the female reproductive cells (ova).
    ovaries
  • The heart pumps blood around the body through __________.
    blood vessels
  • The _______ is connected to the testicles. It contains the urethra. The sperm pass through the urethra and are expelled out of the body.
    penis
  • A _______ is created when a male cell fuses with a female cell.
    zygote
  • At the end of the bronchioles, there are tiny air sacs, called ________. They are surrounded by blood capillaries.
    alveoli
  • 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 _______ is a hollow organ with muscular walls. It expands during pregnancy to contain the growing ________.
    uterus, foetus
  • _______ take blood to the heart.
    Veins
  • The female cell in reproduction.
    ovum
  • The embryo is attached to the placenta by the _________.
    umbilical cord
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