HTHSCI 1H06 Chapter Notes - Chapter 4: Glycogen, Myosin, Toshiyori
14 Dec 2015
School
Department
Course
Professor
Document Summary
Week 3 consists of elongated cells called muscle fibers(myocytes) that can use atp to generate force. Muscular tissue produces body movements, maintains posture, provides protection and generates heat. Three types: based on location, anatomy, and how they are controlled by nervous and endocrine systems: skeletal muscle, cardiac muscle, smooth muscle. Most skeletal muscles move the bones of the skeleton: a few move the skin and other skeletal muscles. Diaphragm contracts and relaxes without conscious control so you don"t. You don"t consciously think about contracting the skeletal muscles that maintain your stop breathing posture or stabilize body positions. Only in the heart -> heart wall. Alternating contraction and relaxation of the heart is not consciously controlled: heart beats because it has a natural pacemaker that initiates each contraction, autorhythmicity: built-in rhythm of the heart. Several hormones and neurotransmitters can adjust heart rate. Characteristics: usually involuntary, some muscles have autorhythmicity.
