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Academia - Collins Scientific Pocket Dictionaries - Biology
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gall bladder
The device is better

Biliary vesicle. Bitterness. A small vesicle in the liver or near it in vertebrates in which bile is stored. When food enters the intestine, the bile sac empties bile into the duodenum through the bile duct. duct . See digestion.

gamete
game m

A reproductive cell whose nucleus was formed by meiosis and contains half the normal number of chromosomes (haploid). The male reproductive cells for humans are spermatozoa and the female ones are ova (egg cells. The two types fuse during fertilization to form a zygote in which the normal number of chromosomes is restored ( Diploid). Thus, the situation in humans is:

Diploid cell
meiosis
Single formula brides
fertilization
Binary formula


gametophyte
gametophyte m

A game plant developed from the life cycle. A plant that carries gametes. This phase may or may not be dominant in plants that show alternation of generations, but it arises from the development of a haploid spore from a sporophyte generation.

gas exchange
échange m gazeux

Gas exchange The process that exchanges organisms
By means of gases with the environment for the purpose of metabolism. Most organisms require a continuous supply of oxygen gas for respiration:

Glucose + oxygen → energy + carbon dioxide + water

In addition to this, green plants need carbon dioxide for the photosynthesis reaction:

Carbon dioxide + water, light energy, chlorophyll, carbohydrates + oxygen

Both reactions are used and produce gases exchanged with the atmosphere (terrestrial organisms) or water (aquatic organisms).

Oxygen Respiration - Photosynthesis Carbon Dioxide + Water


gas exchange (fish)
change my gazebo (poissons)

Gas exchange in fish. Gas exchange occurs through gills, consisting of gill arches to which numerous gill threads are connected. Water is taken through the mouth and passed over the gills, where the oxygen dissolved in the water is absorbed into the blood capillaries, while carbon dioxide diffuses into the water.

Gloss threads
gill arch
Deoxygenated blood coming from the heart
Oxygenated blood for the body
Position of the shutter (remove the cover)

gas exchange (insets)
Change the gazebo (insects)

Gas exchange (in insects). Air enters insects through pores called spiracles and is transported through a branched system of tracheae, and then to smaller branches called tracheoles, in contact with tissues. Gas exchange occurs through the fluid in the bronchioles.

Bronchiole (filled with fluid) respirator Bronchiole (filled with air) muscle


gas exchange (mammals)
change my gazebo (mammifères)

Gas exchange (in mammals). Gas exchange occurs through the alveoli in the lungs as a result of concentration gradients that exist between the air in the alveoli and the deox ygenated blood coming from the heart. These gradients cause the diffusion of oxygen from the alveoli to the red blood cells and the diffusion of carbon dioxide from the blood to the alveoli.

Gas exchange in the alveolus
oxygen
Carbon Dioxide
Red blood cells
Bloody noodles

Alveoli and accompanying blood vessels
Oxygenated blood
Deoxygenated blood from the heart

See breathing in mammals and lungs.