Chapter 7 Muscles Power Point
Chapter 7 Muscles Power Point
Chapter 7 Muscles Power Point
Muscles
Chapter Objectives
Overview of Muscle
List five functions of muscle tissue.
Compare and contrast skeletal, smooth, and cardiac muscle
Structure of Skeletal Muscle Tissue
Using a drawing, identify and describe the special features of
a skeletal muscle cell, and explain hoe many such cells,
along with connective tissue membranes, are built into
skeletal muscle.
Skeletal Muscle Contraction
Define sarcomere and explain how muscle contraction
results from sarcomere shortening.
Overview of Muscle
Functions of muscle
Move body parts
Maintain body posture
Adjust the volume of body structures
Move substances within the body
Produce heat
Muscle Energy
Introduction
ATP fuels three important aspects of muscle activity:
Sarcolemma membrane potential
Cross-bridge cycling
Muscle relaxation
ATP + H2O ADP + H2O + PO4 + energy
Smooth Muscle
Introduction
Occur in all in the walls of all but the smallest blood vessels
and in the walls of hollow organs.
Takes about 25 times as long to contract as skeletal muscle
and consumes 1% as much energy.
Actin myosin cross-bridges may latch semipermanently in a
latch state.
Slow, sustaining contractions