target cells
Hormones are chemical messengers produced by endocrine glands and released into the bloodstream. They travel through the body and bind to specific receptors on target cells, triggering a response. This can influence processes such as growth and development, metabolism, and stress response.
If the signal molecule is able to fit through the cell membrane, it will bind to an intracellular receptor, if it cannot pass through the cell membrane, it will bind to an external membrane-surface receptor.
The process in which glucose and oxygen react in cells to release energy is called cellular respiration. It involves breaking down glucose molecules into carbon dioxide, water, and energy in the form of ATP (adenosine triphosphate).
Glycoproteins that react specifically with the chemical structures in the antigen that induced them are called antibodies. Antibodies are produced by the immune system in response to the presence of antigens, and they bind to these specific structures to neutralize or mark them for destruction by other immune cells.
The fight or flight hormone is adrenaline, also known as epinephrine. It is called this way because it prepares the body to either confront the threat (fight) or flee from it (flight) by increasing heart rate, blood flow to muscles, and energy availability. This response helps the body react quickly in dangerous situations.
Im afraid that your question is quite unclear. If you are refering to how the thymus turns pre-T Cells into Naieve T-cells, this is not a process mediated by a secretion. Its a process called positive and negative selection (or central tollerance) mediated by surface molecules called MHCs present on thymic cells and Dendritic Cells, which eliminates those cells that either do not react with these MHCs or react too strongly. I hope this answers your question.............
The tissue/cells need a receptor that can interact with that hormone in order to respond to it. This receptor may be on a cell membrane, inside the cell, or even inside the nucleus (in the case of steroid hormones, for example.) Like many organic chemicals in the body, they have structures which result in certain parts of the molecule being presented to cells (active sites). Because cells and tissue have different structures as well, only certain cells will react to the presence of a particular hormone. Many hormones have antagonist hormones that cause an opposite effect. This helps control negative feedback when the target organ's hormone levels are too high.
Epinephrine (called adrenaline in non-US English speaking countries)
offense-specific
There is a hormone called epinephrine, also known as adrenalin. This may be what you are wondering about.
Hormones are chemical messengers produced by endocrine glands and released into the bloodstream. They travel through the body and bind to specific receptors on target cells, triggering a response. This can influence processes such as growth and development, metabolism, and stress response.
When an antigen and antibody react it causes cells to clump together. The term used to describe the clumping of cells is called agglutination.
These substances are called buffers.
adrenaline
the thyroid gland
adrenaline.
If the signal molecule is able to fit through the cell membrane, it will bind to an intracellular receptor, if it cannot pass through the cell membrane, it will bind to an external membrane-surface receptor.