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What is a foreign chemical that stimulates the production of antibodies?

An antigen is a foreign chemical that stimulates the production of antibodies by the immune system. Antigens can be bacteria, viruses, toxins, or other substances that are recognized as foreign by the body.


Gastrin secretin and cholecystokinin are examples of?

Gastrin, secretin, and cholecystokinin are examples of hormones that play roles in the regulation of the digestive system. Gastrin stimulates gastric acid secretion, secretin stimulates pancreatic bicarbonate secretion, and cholecystokinin stimulates gallbladder contraction and pancreatic enzyme secretion.


An antigen stimulates B cells to produce a specific what?

An antigen stimulates B cells to produce a specific antibody. This antibody is capable of recognizing and binding to the antigen that stimulated its production, marking it for destruction by other components of the immune system.


The point of contact between the nerve and the muscle fibers it stimulates is called a?

The point of contact between the nerve and the muscle fibers it stimulates is called a neuromuscular junction. This junction allows for communication between the nervous system and the muscular system, facilitating muscle contraction in response to nerve impulses.


Why does nicotine cause tachycardia when it stimulates the parasympathetic nervous system?

Nicotine primarily stimulates the sympathetic nervous system rather than the parasympathetic nervous system. When nicotine binds to nicotinic acetylcholine receptors, it leads to the release of neurotransmitters like norepinephrine, which increases heart rate and causes tachycardia. Additionally, while the parasympathetic system generally slows the heart rate, nicotine's overall stimulatory effects on the body dominate, resulting in an increased heart rate.