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Ova (eggs) are produced by the ovaries, and the testicles produce sperm.
Ova and sperm combine to determine characteristics of offspring.

Nervous system regulates the temperature of the scrotum keeping it about 2 °C lower than the rest of the body which is required for sperm production.

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Protects the body from infection.
Keeps a record of every germ it has defeated.
Works with the respiratory system to create antibodies that protect you from bacteria and viruses.

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Transmits inputs from the environment to the brain.
Transmits instruction from the brain to the rest of the body.
Controls our breathing, digestion and the beating of our heart through their respective systems.

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Provides our body shop, stability and the ability to move.
Protects vital organs.
Controls muscle contraction to operate the respiratory system.

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Made up of all the body's hormones.
Regulates development of the brain and nervous system.
Controls growth and function of reproductive system.

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Delivers oxygen to the body.
Works with the circulatory system to remove waste gases.
Allows us to taste and smell.

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Pumps blood from the heart to the lungs to get oxygen from the respiratory system.
Send oxygenated blood through arteries to the rest of the body.
Veins carry oxygen poor blood back to the heart to start the circulatory process over.

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Saliva begins the breakdown of food.
Digestive enzymes in the stomach continue to breakdown food into simple subtances.
Food passing through the small intestine is absorbed into blood vessels and distributed through the body by the ciculatory system.