أكاديميا - كولنز معاجم الجيب العلمية - البيولوجيا انكليزي - فرنسي - عربي الحرف ١_ l

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lacteals
lactés (vaisseaux). Conduits mpl chylifères

Structure (pipes). Lymphatic vessels within the villi of the intestine in vertebrates. The products of fat digestion (fatty acids and glycerol) diffuse into the lactiferous tubules and are recycled away by the lymphatic system.


lactic acid
lactic acid

Lactic acid Lactic acid is an organic acid (CH3 - CHCHOH COOH) nic produced during respiration in the cells of many animals, including muscle cells in vertebrates and some bacteria (see respiration and oxygen). debt.


large intestine
Gros intestin m

Thick. The posterior part of the intestine in vertebrates. At the entrance to the large intestine in humans, there is a part called the caecum from which the appendix emerges, but most of the large intestine consists of the colon, which leads to the rectum. The large intestine receives undigested matter from the final intestine (ileum). See digestion.


larva
larve f

An intermediate stage larva that is sexually immature, in the life history of some animals between emergence from the egg and puberty, such as the anal state (frog larvae, amphibian tadpole and butterfly larvae caterpillar see metamorphosis).


larynx
larynx m

Larynx: Part of the upper end of the trachea in tetrapods, open to the pharynx and specialized in closing the glottis during swallowing.
The vocal cords in the larynx produce sound in mammals, amphibians, and reptiles. Look . breathing in mammals.


leaf. leaf
feuille f

paper . The part of a flowering plant that grows from the stem. Green in color, usually flat. The functions of the leaf are: (a) photosynthesis. (b) Gas exchange. (c) transpiration. The drawing shows the structure of a dicotyledon leaf.

Upper skin with scale.
Mesophyll with chloroplast
A spongy mesophyll in which chloroplasts are reduced and air spaces are abundant
Lower skin.
Thaghir
Guard cell with chloroplast


lens
lentille f

Lens.
A transparent structure behind the pupil of the eye in vertebrates that is important in scattering images on the retina and in accommodation. See eye and . accommodation


lenticel
lenticelle f

Lentil. One of many pores consisting of stems and woody roots. When bark 6 replaces the epidermis, gas exchange takes place via... Lenticles. See gas exchange. (plants)


leucocyte
leucocyte m

A ball. White See white blood cell


lichen
lichen m

Lichen. A plant formed through a mutualistic relationship between alga and fungus, where the alga provides the fungus with carbohydrates and oxygen and receives water and mineral salts from it in return.


life history (or life cycle)
cycle for life

Life history (or life cycle). The different stages of development that organisms go through from egg to adult. See alternation of generations and... metamorphosis


ligament
ligament m

Ligament: A strong band of collagen that connects the bones at the mobile joints of a vertebrate animal. The ligaments strengthen the joint, allow movement only in certain directions, and prevent dislocation. See joint.