Receptors

Question 1

What is a receptor

Answer 1

Proteins with variable degrees of complexity are sensitive to changes of the external and internal environments

Question 2

Light receptors

Answer 2

Photoreceptors located on the eye register a to give a visual representation of the body surroundings

Question 3

What happens when body is dehydrated

Answer 3

The hormone vasopressin is produced and binds to its receptor located on kidney nephron cells inducing the reabksrobtion of water in the bid

Question 4

How do receptors work

Answer 4

A stimulus activates a receptor which activates an effector or effector system causing generation,propagation and multiplication of series of intercellular events leading to specific cellular events

Question 5

What are the sensory receptors

Answer 5

Baroreceptors, mechanoreceptors, thermoreceptors, photoreceptors,some classified as nocirecpetord which are damage and pain receptors

Question 6

Voltage-gated ion channels

Answer 6

A change in the membrane potentiL causes the protein to chnGe shape and open their activity can be modulated by drugs

Question 7

What is a ligand

Answer 7

Is a substance that forms a complex with a receptor which will affect directly or indirectly a cellular activity - lock and key concept

Question 8

What is lock and key concept

Answer 8

The interaction of ligand with its receptor binding site depends on many factors eg 3D structures electrostatic and hydrophocic interactions

Question 9

Ligand-gated ion channels- receptors responsive to chemicals

Answer 9

are integral membrane proteins that contain a pore which allows the regulated flow of selected ions across the plasma membrane. Ion flux is passive and driven by the electrochemical gradient for the permeant ions.Eg neurotransmitter

Question 10

Receptors with intrinsic enzymatic activity

Answer 10

Means that upon receptor activation they perform enzymatic reaction called phosphorylation on themselves and other proteins eg hormone insulin receptor

Question 11

Intracellular/ nuclear receptor

Answer 11

Receptors for steroid ( testosterone) thyroid hormone vitamins D Internal receptors, also known as intracellular or cytoplasmic receptors, are found in the cytoplasm of the cell and respond to hydrophobic ligand molecules that are able to travel across the plasma membrane

Question 12

I
G protein-coupled receptors

Answer 12

7 transmembrane receptors for hormones: glucagon receptor
Nero transmitter Musca runic ACCESSh receptors extracellular nhcleotides atp p2y receptors G protein-coupled receptors (GPCRs) are seven-transmembrane proteins that are located in the cell membrane, with their N- and C-termini located on the outer and inner surfaces, respectively. GPCRs mediate various cellular responses from the extracellular environmen