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Chapitre 13

Transport membranaire et transporteurs actifs

L'importance du transport membranaire
L'importance du transport membranaire
The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action ...
Transporteurs membranaires
Transporteurs membranaires
Transporters are essential membrane transport proteins with functions related to cell nutrition, homeostasis, communication, etc. Approximately 7% of all ...
Transport facilité
Transport facilité
The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and ...
Transport actif primaire
Transport actif primaire
In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or ...
Pompes ATPase I : vue d'ensemble
Pompes ATPase I : vue d'ensemble
ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic ...
Pompes ATPase II : type P
Pompes ATPase II : type P
The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from ...
Pompes ATPase III : type V
Pompes ATPase III : type V
V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of ...
Transporteurs ABC : exportateurs
Transporteurs ABC : exportateurs
ATP-binding cassette or ABC transporter is the largest superfamily of integral membrane proteins. The transporters have transmembrane-binding domains ...
Transporteurs ABC : importateurs
Transporteurs ABC : importateurs
ATP-binding cassette or ABC transporters are a class of ATP-driven pumps that hydrolyze ATP to move solutes across the membrane. They can be grouped into ...
Transporteurs de glucose
Transporteurs de glucose
Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the ...
Transport actif secondaire
Transport actif secondaire
One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this ...
Transport transcellulaire des solutés
Transport transcellulaire des solutés
Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is ...
Absorption du glucose dans le petit intestin
Absorption du glucose dans le petit intestin
Complex carbohydrates consumed cannot be absorbed into the small intestine in their original form. First, they must be hydrolyzed to a monosaccharide form ...
Régulation du pH dans l'estomac
Régulation du pH dans l'estomac
The human body carefully regulates the internal pH of different organs to maintain homeostasis. For example, while the blood plasma maintains a neutral pH ...
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