Chapter 10 (Muscular Tissue XIII)

Question 1

Principal tissue in the heart wall

Answer 1

Intercalated discs connect the ends of cardiac muscle fibers to one another
Cardiac muscle tissue contracts when stimulated by its own autorhythmic muscle fibers
Contractions lasts longer than a skeletal muscle twitch
Have the same arrangement of actin and myosin as skeletal muscle fibers
Mitochondria are large and numerous
Depends on aerobic respiration to generate ATP

Question 2

Intercalated discs at the ends of cardiac muscle fibers

Answer 2

Allow muscle action potentials to spread from one cardiac muscle fiber to another

Question 3

What is a major physiological difference between cardiac and skeletal muscle tissue?

Answer 3

Continuous, rhythmic activity

Question 4

Aerobic respiration

Answer 4

Requires a constant supply of oxygen

Able to use lactic acid produced by skeletal muscle fibers to make ATP