Cigarette smoke contains over 4,000 chemicals, including 43 known cancer-causing (carcinogenic) compounds and 400 other toxins. These include nicotine, tar, and carbon monoxide, as well as formaldehyde, ammonia, hydrogen cyanide, arsenic, and DDT.
Involuntary muscles are muscles that are not controllable consciously, and instead contract due to unconscious impulses sent by the autonomic nervous system or certain specialized cells or hormones.Both smooth muscle and cardiac muscle can be classified as involuntary muscles.Smooth muscle is comprised of spindle-shaped cells that have no striations and is found in numerous locations throughout the human body. Cardiac muscle is striated rather than smooth, and is found only within the walls of the heart. beating heart is one of the best examples of an involuntary muscle. Contractions of cardiac muscles push blood through the four chambers of the human heart. The process of peristalsis, which pushes food through the esophagus and small intestine, is controlled by involuntary muscles.
Best Answer: voluntary muscles allow you to move them in voluntary muscles you have no control of voluntary muscle is muscle that we have control of.. skeletal muscles are voluntary muscle.. they are the reason you can flex your bicep, tricep, or any other movement..involuntary muscle is muscle that we have no control of.. cardiac and smooth muscle are involuntary muscles.. the muscle of the heart is involuntary.. you dont have to make your heart beat..it beats by itself..The voluntary muscles also called as skeletal muscles or striated muscles (presence of striation due to regular black and white bands).eport Abuse. voluntary muscle is muscle that we have control of.. skeletal muscles are voluntary muscle.. they are the reason you can flex your bicep, tricep, or any other movement.. involuntary muscle is muscle that we have no control of..