When you exercise, nerves of the autonomic nervous system cause an increase in your heart rate in order to deliver more blood to the active tissues. When you relax or sleep, the autonomic nervous system lowers your heart rate.
According to the Pearson Anatomy and physilology team-- Editor Serina Beaupariant pg 185
There are some muscles in the body we cannot control: they are called involuntary muscles and cardiac muscles. Involuntary muscles are found in the digestive tract for example. Cardiac muscles are found in the heart. Neither these two muscle types are controlled. We can control what are called voluntary muscles which are the muscles that were used to move our bones.
The heart is an involuntary muscle.Involuntary muscles are smooth muscles that are not directly controllable at will. Voluntary muscles are controllable like those found in your arms, legs, hands, etc.
Cardiac, skeletal, and smooth muscles.the three types of muscle in the body: cardiac (heart), skeletal (biceps, quadriceps etc.), and smooth muscle (found in the intestinal tract such as stomach and colon).
Involuntary organs are those organs which are not under the control of your will. These are very important for the functioning of the body. Heart is an example of it.
Involuntary muscles are those which you don't really have much control over. For example- the most important one: your heart. also, all your smooth muscles, like those lining blood vessels, the digestive track, bladder and passageways to your lungs, are all involuntary.
Generally, skeletal muscle is voluntarily controlled and smooth muscle is not. Some structures have a combination of both. For example, the bladder is made up of smooth muscle and consists of some skeletal muscle at the sphincter which is capable of "holding" it until you are ready.
All the muscles that allow you to move your body are called voluntary as you have to think about it and the nervous system makes them respond. There are two others: smooth muscles which are involuntary and are found in the digestive tract for example and cardiac muscle found in the heart. It is also involuntary.
The Drug released as Viagra, targets an involuntary groin muscle in men. When taken it relaxes that muscle to allow the flow to pass and correcting e.d. Temporarily.
A voluntary behavior is something that you choose to do, such as running, standing and reading. Involuntary behaviors are those that you have no control over such as blinking and muscle twitches.
Voluntary muscles chose to be moved and your will. For example your pectoral muscles and or your biceps. You can flex them and move them to your control by giving in nerve signals from your brain to that muscle. Involuntary muscles have automatic neurological control. Example would be the heart, you don't think about it but it still beats, and if you do exercise your brain automatically tells your heart to beat faster to pump more blood into your body.
To do a voluntary action means to do it without pay, or without having to be asked or forced.Example:Martin's voluntary cleanup of the rubbish surprised them since nobody had asked him to do it.Voluntary means proceeding from one's own choice.
Voluntary (or skeletal) muscle cells, involuntary (or smooth) muscle cells, and cardiac (or heart) muscle cells, all have thick and thin filaments (myosin and actin, respectively), for their sliding filament mechanism, enabling movements However, since their funscions are different, there are significiant differences in their structures: shapes, sizes, proportion of filaments, their response to stimulus, and the kind of stimulus itself, for example.