Biology

  • Created by: TiaShauna
  • Created on: 26-11-17 12:26
Organised Cells
A collection of cells working together is called Tissue. A collection of tissues working together form an Organ. Different organs working together form an Organ System. Each organ system has a particular function within an Organism.
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Digestive System 1
Digestion is the break down of foods into small molecules which are absorbed by the body.
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Salivary Glands
Produces saliva containing amylase.
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Oesophagus
Muscular tube which moves ingested food to the stomach.
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Stomach
Muscular organ where digestion continues.
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Liver
Produces bile.
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Pancreas
Produces digestive enzymes.
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Gall Bladder
Stores bile before releasing into the small intestine.
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Small Intestine
Food is digested and absorbed into the blood.
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Large Intestine
Reabsorbs the water before producing waste products.
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Anus
releases the waste products out of the body.
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Circulatory System
Blood carries oxygen and nutrients to the body’s cells, and waste products away from them.
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Heart
Which is the muscular pump that keeps the blood moving.
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Arteries
Which carry blood away from the heart. They have thick outer walls thick layers of muscle and elastic fibres.
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Veins
Which return blood to the heart. They have thin walls thin layers of muscle and elastic fibres.
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Cappilaries
Which are tiny blood vessels that are close to the body’s cells.
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Capillaries 2
The function of capillaries is to allow food and oxygen to diffuse to cells while waste is diffused from cells. Capillaries have thin walls - only one cell thick - that allow them to effectively perform their function.
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Double Circulation
Humans have a double circulatory syste. In te first circuit, blood is pumped from the heart to the lungs. In the second circuit oxygenated blood leaves the heart and goes around the body and deoxygenated blood returns to the heart.
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Respiratory System
The human respiratory system is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The primary organs of the respiratory system are lungs, which carry out this exchange of gases as we breathe.
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Ventilation
Movement of air within the lungs.
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Inhalation-Breathing In
Intercostal muscles move the ribs upwards and outwards. This causes the diaphragm to contract. There is low pressure in the lungs than outside, causing air to rush in.
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Exhalation- Breathing Out
Ribs move downwards and inwards. This allows the diaphragm to expand and relax. There is high pressure in the lungs than outside, causing air to rush out.
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Alveoli
This is where gas exchange happensin the lungs. These are tiny sacs that are found n the end of the branicholes
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Alveoli 2
They have thin walls (just one cell thick) large surface area moist surface many blood capillaries
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Gas Exchange
The diffusion of gases from an area of higher concentration to an area of lower concentration, especially the exchange of oxygen and carbon dioxide between an organism and its environment.
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Gas Exchange 2
In plants, gas exchange takes place during photosynthesis. In humans, gas exchange takes place during respiration.
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Exchange in the Villi
Villi are folds within the wall of the small intestine across which digested food molecules are exchanged between the gut and the bloodstream. This exchange takes place by diffusion and active transport.
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Other cards in this set

Card 2

Front

Digestion is the break down of foods into small molecules which are absorbed by the body.

Back

Digestive System 1

Card 3

Front

Produces saliva containing amylase.

Back

Preview of the back of card 3

Card 4

Front

Muscular tube which moves ingested food to the stomach.

Back

Preview of the back of card 4

Card 5

Front

Muscular organ where digestion continues.

Back

Preview of the back of card 5
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