What do you mean by neurotransmitters, Biology

Assignment Help:

Q. What do you mean by neurotransmitters?

- Nicotinic receptors (nicotine mimics the effects of Ach here). Found at NM-junction, ANS ganglions in general. Binding of Ach to nicotinic receptors is always excitatory (e.g. skeletal muscle contraction).

- Muscarinic receptors occur on all effector cells stimulated by the parasympathetic system. Effect of Ach on muscarinic receptors may be excitatory or inhibitory depending on target organ.

ACh -> (-) heart myocardium, however, ACh -> (+) GI tract smooth muscle

ACh is normally destroyed by ACh-ase, a degradative enzyme found on post-synaptic cells.

Nerve gas is a potent inhibitor of Ach-ase activity -> magnifies cholinergic effects, however, less potent is neostigmine (used in the treatment of myasthenia gravis).

Atropine is a reversible blocker of ACh used in cardiac rescucitation (blocks acetylcholine; so stimulates heart beat). 


Related Discussions:- What do you mean by neurotransmitters

Introduction to fertilization, INTRODUCTIO N - Fertilization is a c...

INTRODUCTIO N - Fertilization is a complex process which involves fusion of male & female gametes. The male gamete in animals is called as sperm & the female gamete as o

What is gel, What is Gels Sol is free flowing liquid at room temperatur...

What is Gels Sol is free flowing liquid at room temperature, when it becomes relatively firm, it is called a gel. There are a number of factors that affect the strengths, elast

Describe the basic function of platelets, Q. What is the function of platel...

Q. What is the function of platelets? What consequences does the clinical condition known as thrombocytopenia yield? Platelets, also known as thrombocytes are fragments of gian

What are fitness tests, What are Fitness Tests? Testing is an important...

What are Fitness Tests? Testing is an important evaluation tool for the sports performer as it gives them an insight into their current physical condition and the effectiveness

Define the plasma membrane and its function, Similar to all animal cells, p...

Similar to all animal cells, protozoans are covered by a plasma membrane which surrounds cytoplasm of the cell, protozoan's integument or skin. Like all membranes, it's permeable;

Explain cardiac calcification, Q. Explain Cardiac calcification? Peric...

Q. Explain Cardiac calcification? Pericardial Calcium is most dense in the atrioventricular grooves and is seen as thick oblique circles or arcs of calcification. From th

Lipoproteins, LIPOPROTEINS They are complex biomolecules formed of -...

LIPOPROTEINS They are complex biomolecules formed of - T riglycerides, Phospholipids, Cholesterol and Proteins. Lipoproteins are of four types - Chylomicrons

Bovine viral diarrhoea, Bovine viral diarrhoea Bovine viral diarrhoea ...

Bovine viral diarrhoea Bovine viral diarrhoea (BVD) and mucosal disease (MD) are clinically dissimilar disease syndrome yet have a common viral etiology. The acute disease is

Regulatory factors, 1. Describe how the hypothalamus regulates the secretio...

1. Describe how the hypothalamus regulates the secretion of anterior pituitary hormones and identify all of the individual hypothalamic regulatory factors. Describe how the hypotha

Is transpiration the only way by which leaves lose water, Is transpiration ...

Is transpiration the only way through which leaves lose water? Plants do not only lose water as vapor, as by transpiration. The leaves also lose liquid water by a phenomenon c

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd