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JC Science
JC Science

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JC Science

The organs of the digestive system and their functions.

Mouth:

• take in food

• crush food with the teeth

• amylase is added to the food

Oesophagus:

• Carry down food to the stomach

Stomach:

• churn the food

• add acid to the food

Small intestine:

further digestion by enzymes

• absorption of digested food into the blood.

Large intestine:

water is absorbed into the blood

• the waste left is prepared for egestion

Salivary glands:

• make saliva, which contains an enzyme, amylase, to break starch down to small sugars

Liver:

produces liquid bile, which helps digest fat

• regulates the amount of... (More)

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JC Science

Biodiversity on Earth - Science

BIODIVERSITY

Biodiversity - is the variety of living species on earth.

  • Natural ecosystems can have a large number of species, when humans interfere with one species in the natural ecosystem they can accidentally affect other species or even the entire ecosystem.
  • It is important to make sure that in the future we will have water, materials, and resources to protect human health and our environment which means we have to use our resources wisely and with sustainability.

Sustainability - means maintaining the world we live in for future generations of people and species.

Human activities can threaten biodiversity by:

  • deforesting... (More)
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JC Science

The three main divided parts of the brain

The brain can be divided into three parts,

Cerebrum: the cerebrum is divided into different parts called lobes. Each lobe has it's own job to do, but all of the lobes work together to help us respond to the world around us.

Brainstem: the brainstem connects the base of the brain to the spinal cord. It looks like a stem. It controls critical functions, like your heart rate, breathing and sleep/wake cycles. 

Cerebellum: the cerebellum is a small part of the brain that is responsible for mortar learning, sense of body position, balance and fine movement coordination.