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torisob [31]
2 years ago
6

At the inferior end of the trachea is an internal ridge of mucosal covered cartilage that initiates a cough reflex when it is st

imulated; this structure is the __________.
Biology
1 answer:
VMariaS [17]2 years ago
8 0
The answer is Tracheal Carina
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Α-adrenergic receptors have a higher affinity for norepinephrine than for epinephrine. Β-adrenergic receptors have a higher affi
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Answer:

Receptors are highly specific and only have high affinity for those ligands for whom they are specific.

Explanation:

Receptors are proteins that receive a stimulus or bind a ligand and mediate effects via receptor effector system.

Receptors are macromolecules that are highly specific.

The affinity between the ligand and the receptors is determind by the disassociation constant Kd.

The receptors produce maximun effect when an appropriate specific stimulus is present.

Different recptors types are present for different ligands.

For example, muscrinic receptors are specific for acetycholine and adrenergic receptors are specific for adrenaline/nor adrenaline.

It is important to know the specificity so that the body remains in a state of balance.

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3 years ago
What are two reasons for why a species might disappear from the fossil record?
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the baby is in the 2nd trimester...

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An example of a catadromous fish: A. Atlantic eel B. Parrotfish C. Whale shark D. Atlantic salmon E. Pacific salmon
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An example would be Atlantic salmon . :)
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It's not.

If the plants are growing under the ice and the ice is floating above it on the surface of the water and the ice blocks the light from getting to the plant.
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