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Natural Science Year 4 Unit 2

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  • Breathing in or out? Chest gets smaller... diaphragm relaxes and goes up.
    Breathing OUT
  • Digestion takes place mainly in the _______ but some nutrients are digested in the ______ and _______.
    small intestine, mouth & stomach
  • What fertilizes an egg?
    Sperm
  • What is the liquid in the mouth that helps to break down food?
    Saliva
  • The lungs are filled with lots of little bags. What are they called?
    Alveoli
  • There are lots of blood vessels. Nutrients pass into the blood here.
    Small intestine.
  • What are the male reproductive organs? Which organ does sperm come from?
    Testicles, urethra and penis. Sperm comes from the testicles.
  • The egg divides again and again, and attaches to the wall of which organ?
    Uterus
  • Name the parts of the circulatory system
    Heart and blood vessels
  • When does the embryo become a fetus?
    9 weeks
  • _________ are blood vessels that RETURN blood to the heart from the rest of the body.
    Veins
  • The urine leaves the body through this tube.
    Urethra
  • ________ are blood vessels that carry blood from the heart to the rest of the body.
    Arteries
  • There are where oxygen and nutrients are exchanged for carbon dioxide and other waste products.
    The capillaries.
  • The trachea divides into two tubes that go into the lungs. What are these tubes called?
    The bronchi.
  • Some things are not digested because they are small enough to pass into the blood without being digested. What are they?
    Water, minerals and vitamins
  • Each time the heart pumps it is called a __________.
    Heartbeat. Followup: what is a "normal" heart beat?
  • The urine goes down these TUBES to the bladder.
    Ureters
  • What is the purpose of the excretory system?
    To remove excess water and other waste products from our body.
  • When does a fetus have all of its organs?
    At three months
  • The _______ protect the lungs and heart, and the ______ protects the brain.
    ribs, skull
  • Blood is pumped through the heart to the rest of the body. What does it deliver and what does it pick up?
    Delivers oxygen and picks up carbon dioxide.
  • What is the diaphragm?
    It is a muscle below our lungs that helps us breathe in and out.
  • Our nervous system controls everything that we do, including voluntary and involuntary actions. What is an example of both?
    Voluntary: when we feel cold and decide to put on a jumper, or decide to kick a football. Involuntary: heartbeat, digesting food or breathing
  • The nose has two ______ that have lots of little hairs and are narrow at the back. What do we do when a foreign object enters our nose?
    nostrils. we sneeze!
  • What is the purpose of the reproductive system?
    It allows us to have children.
  • Here, gastric juices make the food into a thick liquid
    Stomach
  • What are the female reproductive organs? Where do the eggs come from?
    Ovaries, uterus, fallopian tubes, vagina. Eggs come from the ovaries.
  • This organ filters the blood, and excess water and waste products are dropped off and made into urine.
    Kidneys
  • What makes up the nervous system?
    brain, spinal cord and nerves
  • How does an embryo get nutrients from it's mother?
    umbilical cord
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