أكاديميا - كولنز معاجم الجيب العلمية - البيولوجيا انكليزي - فرنسي - عربي الحرف ٢_ t

Academia - Collins Scientific Pocket Dictionaries - Biology
English - French - Arabic letter 2_ T


testis
testicle f

testis. The primary reproductive organ in male animals that produces semen. The testes in vertebrates also produce sex hormones. See fertilization in humans.


tetrapods
tetrapods mpl

Tetrapods. Vertebrates with two pairs of pentadactyl limbs, living mostly on land.


thorax
thorax m

Chest. The part of the body in mammals that contains the heart and lungs (chest cavity). It is separated by the diaphragm from the abdomen in mammals, and in insects it is a part of the body located in front of the abdomen. See abdomen.


thyroid gland
Glande f thyroïde

Thyroid. An endocrine gland in the neck area of ​​vertebrates, when stimulated by thyroid stimulating hormone (TSH) coming from the pituitary thyroxin hormone, produces a gland that controls the rate of growth and development in young animals.

For example, thyroxine in the frog larva stimulates metamorphosis. See hormones.


thyroid-stimulating hormone (TSH)
hormone m thyroïdienne

Thyroid stimulating hormone. See thyroid gland.


tibia
tibia m

Tibia. 1 - One of the pieces of an insect’s leg.
2 - The front bone of the bones of the lower back end in quadrupeds, which is the largest leg bone (tibia) in humans, see endoskeleton.


tissue
tissu m

Tissue is a group of similar cells specialized to perform a specific function in multicellular organisms, such as muscle and xylem.

tissue fluid
Ask the phone

Tissue fluid. See lymph.


trachea
trachée f. trachée - artère f

trachea bronchus 1 - In terrestrial vertebrates, it is the trachea that emanates from the larynx, carrying air to the lungs, where the trachea divides into two bronchi. The trachea is supported by rings of cartilage with a ciliated epithelium that secretes mucus that traps dust and microorganisms. (2) In insects, one of the branched tubes of the air system through which air is distributed into the tissues via spiracles. Look . gas exchange (insects).


transect
coupure f transfer

Accidental interrupter. A marked line in an area to study species by taking samples of organisms from different points along the line. Measurements of environmental factors, such as light, soil pH, etc., can also be made along the line to discover any existing relationship between the distribution of certain species and these factors.

translocation
translocation f

Change location. Transport and circulation of materials within plants. It includes:

(a) Water and mineral salts in the xylem vessels via transpiration.

(b) Carbohydrates produced by photosynthesis and transported throughout the plant by phloem sieve tubes.


transpiration
transpiration f

Transpiration. Water vapor rises from plant leaves through stomata.


transpiration rate
This includes transpiration

Transpiration rate. Transpiration is affected by many environmental factors:
(a) Temperature: High temperature leads to increased evaporation of water and consequently increased transpiration. (b) Humidity (water content of the air): Increased humidity makes the atmosphere saturated with water, which reduces transpiration.

(c) Wind: Wind: Increased air movement accelerates transpiration, as it prevents the atmosphere surrounding the stomata from becoming saturated with water.

Therefore, the transpiration rate becomes higher in hot, dry, and windy conditions. If the rate of water loss through transpiration exceeds the rate of water intake, plants may wilt.