BIOS-252 Anatomy & Physiology II with Lab BIOS252 Exam 1 Describe skeletal muscle - Striated - Voluntary muscle - Is 40% to 50% of body weight ("red meat" attached to bones) - Long, slender, multinucleated cells that are organized in parallel to one a nother Describe smooth muscle - Nonstriated, involuntary, visceral muscle - Found in walls of hollow visceral structures such as digestive tract, blood vessels, and ureters - Contractions not under voluntary control; movement caused by contraction is involuntary Describe cardiac muscle - Comprises bulk of heart - Cells branch frequently - Characterized by unique dark bands ---intercalated disks - Intercalated disks allow cardiac muscle cells to contract efficiently as a whole unit - Uninucleate - Striated - Involuntary control Identify the similarities between the three types of muscle. - Smooth and cardiac are uninucleated, under involuntary control - Cardiac and skeletal are striated Describe Contractibility Ability to contract(shorten) Describe Excit ability Responds to stimulation Describe Elasticity Ability to go back to resting state Describe Extensibility Ability to extend or stretch without damage
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