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Changes to the Composition of Blood

Hormones

Dot Point

Hormones are secreted by various glands in the body eg. Adrenal glands

The hormones are targeted and absorbed by specific cells in the body.

Describe the main changes in the chemical composition of the blood as it moves around the body and identify tissues in which these changes occur

Nitrogenous Wastes

Chemicals in Blood

There are four basic groups of chemical transported in the blood.

  • Gases
  • Nutrients
  • Wastes
  • Hormones

An increase in nitrogenous wastes occurs once the blood passes through the liver.

A decrease in nitrogenous wastes occur at the kidneys where the blood is filtered and waste such as urea is taken out and excreted from the body.

Blood Gases

Blood is oxygenated at the lungs and the carbon dioxide is released from the body. This is called external gaseous exchange

Internal gaseous exchange occurs at the tissues of the body. Where the oxygen is released to the cells and carbon dioxide is picked up

Digestive Products

Digestive end products such as (glucose, fatty acid and amino acid) is increased around organ responsible for digestion. (small intestine).

Digestive end products are reduced at the liver, chemicals such as glucose is converted to glycogen and stored.

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