Answer:
The correct answer would be A. somatic nervous system.
A somatic nervous system is sub-set of the peripheral nervous system which controls the voluntary actions and body movements with the help of skeletal muscles.
This system mainly consists of two types of nerves:
Afferent nerves: Theses are sensory nerves which carry stimulus or information from receptors to the central nervous system (brain and spinal cord).
Efferent nerves: These are also termed as motor nerves which carry commands or responsive information from the central nervous system to the muscles.
The muscles contract and produce movements.
Answer:
The majority of the cell membrane is composed of PHOSPHOLIPIDS.
Explanation:
Phospholipids are a type of lipid that is found in the cell membrane of cells. This type of lipid are a good fit for cell membrane because they have the capacity to form bi layers. The lipids are divided into tail and head regions; the head is hydrophilic in nature while the tail is hydrophobic in nature. The hyrophilic head is made up of phosphate group while the hydrophobic tail is made up of fatty acid molecules.
Answer:
The mechanism by which cells regulate their ability to respond to extracellular messengers is known as receptor signalling.
Explanation:
Cells senses an environment and communicate which each other through ligand-induced activation of signalling receptors at the cell surface. Signalling receptors enter the endocytic pathway and are sorts into various compartments. Endocytosis regulates cell signalling by controlling the number of receptors available for activation in plasma membrane and activation of receptors or downstream effectors often stimulate receptor endocytosis.
Answer:
organisms and their environments.
Explanation:
Answer:
Primary active transport directly uses a source of chemical energy (e.g., ATP) to move molecules across a membrane against their gradient.
