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Natural Science Year 4 Unit 2
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What is the purpose of the reproductive system?
It allows us to have children.
What are the male reproductive organs? Which organ does sperm come from?
Testicles, urethra and penis. Sperm comes from the testicles.
What are the female reproductive organs? Where do the eggs come from?
Ovaries, uterus, fallopian tubes, vagina. Eggs come from the ovaries.
When does a fetus have all of its organs?
At three months
When does the embryo become a fetus?
9 weeks
How does an embryo get nutrients from it's mother?
umbilical cord
The egg divides again and again, and attaches to the wall of which organ?
Uterus
What fertilizes an egg?
Sperm
The _______ protect the lungs and heart, and the ______ protects the brain.
ribs, skull
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
What makes up the nervous system?
brain, spinal cord and nerves
The trachea divides into two tubes that go into the lungs. What are these tubes called?
The bronchi.
What is the diaphragm?
It is a muscle below our lungs that helps us breathe in and out.
Breathing in or out? Chest gets smaller... diaphragm relaxes and goes up.
Breathing OUT
The lungs are filled with lots of little bags. What are they called?
Alveoli
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!
There are where oxygen and nutrients are exchanged for carbon dioxide and other waste products.
The capillaries.
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.
________ are blood vessels that carry blood from the heart to the rest of the body.
Arteries
_________ are blood vessels that RETURN blood to the heart from the rest of the body.
Veins
Each time the heart pumps it is called a __________.
Heartbeat. Followup: what is a "normal" heart beat?
Name the parts of the circulatory system
Heart and blood vessels
The urine leaves the body through this tube.
Urethra
The urine goes down these TUBES to the bladder.
Ureters
This organ filters the blood, and excess water and waste products are dropped off and made into urine.
Kidneys
What is the purpose of the excretory system?
To remove excess water and other waste products from our body.
There are lots of blood vessels. Nutrients pass into the blood here.
Small intestine.
What is the liquid in the mouth that helps to break down food?
Saliva
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
Digestion takes place mainly in the _______ but some nutrients are digested in the ______ and _______.
small intestine, mouth & stomach
Here, gastric juices make the food into a thick liquid
Stomach
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