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Academia - Collins Scientific Pocket Dictionaries - Biology
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oesophagus
oesophage m

Esophagus. A section of the alimentary canal that connects the mouth and the digestive areas. In mammals, it extends from the pharynx to the stomach and transports food by peristalsis. See digestion.


oestrogen
oestrogene m

.Masculinity. Estrogen is a hormone secreted by the ovaries in vertebrates. It stimulates the development of secondary sexual characteristics in female mammals, and is important in the menstrual cycle.


olfactory
olfactif

olfactory. Describe the functions and parts of the body they relate to
With the sense of smell.


omnivore
omnivore m

She continued. An animal that feeds on both plants and animals. Carnivores include humans whose dentition, like other carnivores, contains the dental features of both herbivores and carnivores, consisting of biting, tearing, and grinding teeth to suit a mixed diet.
. see teeth and dental formula

optic
optique

Visual. A description of the parts of the body related to the eye
And its functions.


optic nerve
nerf m optique

The optic nerve is a cranial nerve in vertebrates
It transmits nerve impulses from the retina. eye look. brain to brain retina


oral
oral

Oral. A description of the parts of the body and their functions related to the mouth.


order. order
ordre m

The class of a unit used in the classification of living organisms, consisting of one or more families.


organ. organ
organe m

An organ is a group of different tissues in a plant or animal that form a structural and functional unit, such as the liver or the leaf of a plant.

Different organs can relate to each other to form a system, such as the digestive system.
Cells → tissues → organs → systems


organ of Corti
organe m de corti

Member of Corti. See cochlea.


organic compounds
Composés mpl organiques

Organic compounds are compounds that contain carbon and are found in all living organisms. The main organic compounds are: carbohydrates, fats, nucleic acids, proteins, and vitamins.
. See inorganic compounds


osmoregulation
Regulation of osmotique

Osmosis control. Osmotic pressure control,
(a) Marine water organisms:
Low salt concentration and high water concentration
Water leaves by osmosis
High salt concentration and low water concentration
Constant swallowing of water

(b) Freshwater organisms:
Low water concentration.
Producing large amounts of diluted urine.
High concentration of water
Water enters by osmosis

Hence the water content, in organic. See osmosis.
Here are some examples of osmosis control:
(c) Terrestrial organisms: acquiring water from food
Drinking is a side product of respiration.

Loss of water (1) through sweating (2) with exhaled air (3) in the form of urine.

The balance of water and mineral salts is mainly controlled by the kidneys.


osmosis
osmose f

Osmosis. Diffusion of solvent molecules - water - usually across a selectively permeable membrane from an area of ​​high solvent concentration to an area of ​​low solvent concentration. For example:

Examples of selective permeability membranes include: (a) cell membranes, (b) dialysis tubes. These membranes are believed to have tiny pores that allow the rapid passage of small water molecules but limit the passage of larger solute molecules.

Selective membrane permeability

Because the cell membrane is selectively permeable, osmosis is important for the passage of water to and from cells and organisms, and it depends on osmotic pressure. See wall pressure and turgor.