BIO 252 Anatomy and Physiology II Exam 1 Review

Describe skeletal muscle - ANS: -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 another Describe smooth muscle - ANS: -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 - ANS: -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. - ANS: -Smooth and cardiac are uninucleated, under involuntary control -Cardiac and skeletal are striated Describe Contractibility - ANS: ability to contract(shorten) Describe Excitability - ANS: responds to stimulation