What does not act as a stimulus to initiate a muscle contraction?

What do not act as a stimulus to initiate a muscle contraction a. hormonal activity b. neurotransmitters c. a change in the pH of a muscle d. a change of temperature?

d.

What is a Non-dihydropyridine calcium channel blockers?

Diltiazem and verapamilBoth act centrally at heart muscle contraction

What does curare act by in the neuromuscular junction?

Curare acts by blocking nicotinic acetylcholine receptors at the neuromuscular junction, preventing the binding of acetylcholine to these receptors. This leads to muscle paralysis since acetylcholine is unable to initiate muscle contraction.

What role does interneuron play in the reflex arc?

Interneurons act as critical relay points within the reflex arc, facilitating communication between sensory neurons and motor neurons. When a sensory neuron detects a stimulus and transmits a signal, interneurons process this information and may modulate the response before signaling motor neurons to initiate an action, such as muscle contraction. This rapid processing allows for quick reflex responses, ensuring the body can react swiftly to potentially harmful stimuli.

What is Generalisability?

act of generalizing; general statement or conclusion; (Psychology) act of reacting to a new stimulus as to a similar stimulus

Why muscle contraction doest not occur below threshold stimulus?

The principle that governs this is called the All-or-none Law. The best way to explain how it works may be best illustrated by an analogy. Are you familiar with how a spark of electricity can jump a gap? Or how lighting seems to come down as a huge flash? Both of these are acting very much like what a muscle cell must do to contract. The impulse that triggers either of these is electrical, and so it needs so have a certain amount of charge to be strong enough to jump either the gap between two wires or between the clouds and the ground and crash down as lighting. Just like you can't have just a little bit of lightening, a muscle cannot do just a little bit of contracting, it has to do it all or do none at all. So it waits until the current is strong enough to run the length of its sarcomeres in the myofibrils that make up the muscle cell and it gives it all its got. The reason this may seem counterintuitive is that we rarely ever experience just one single muscle cell contract because they usually act in a group called a motor unit. You can think of a motor unit as a taxi cab service, and when it goes out to do its job it sends all of its taxis (muscle fibers in its company) to do all the work they can. The way you contract a muscle made of many motor units that are made of many individual cells is that the central nervous system select how many motor units (taxi companies) it calls into action. To us it feels like we are using different amounts of effort, but we are just selecting how many companies of taxi cabs (motor units) to call into action. To the taxi cars, themselves, they are all driving around at their highest capacity, just like the all-or-none law says they should.

What structure is found in cardiac muscle tissue but not skeletal muscle tissue?

Intercalated discs are unique to cardiac muscle tissue, providing a strong connection between adjacent cells and allowing for coordinated contraction of the heart. Skeletal muscle tissue lacks intercalated discs since individual muscle fibers act independently.

What is the term that describes the muscles ability to maintain a slight contraction keeping the muscle firm?

Synergy is the term for the ability of muscles to be slightly contracted at all times to be ready to act. Most of the muscles are usually in this form.

To which part of the mind does a suggestion act as a stimulus?

Emotion

Is the stimulus bill the same as the American Recovery and Reinvestment Act of 2009?

yes the American recovery and reinvestment act (ARRA) is the same thing as the stimulus package. the (ARRA) is the real name.

What is the main function of a SA node?

The main function of the sinoatrial (SA) node is to act as the heart's natural pacemaker. It generates electrical impulses that initiate each heartbeat, regulating the heart rate and ensuring the proper timing of atrial contraction. Located in the right atrium, the SA node influences the overall rhythm of the heart by coordinating the contraction of the heart chambers.

What movements act on the food from the time it leaves the mouth to the time it is digested?

Peristaltic movement of the muscle propels the food ingested further in the digestive system. This movement occurs by rhythmic contraction and relaxation of the muscles.