Lecture 8: Skeletal Muscle and Smooth Muscle

Question 1

What are the four general characteristics of muscle?

Answer 1

1. specialized for contractility
2. Electrical excitability and conductance
3. It occupies a large volume of the body
4. Movement is accomplished by the interaction of actin or myosin filaments

Question 2

What two functional capabilities make muscle the only cell type capable of integrated movement?

Answer 2

electrical excitability and conductance, which conduct an action potential

Question 3

TRUE or FALSE: Muscle energy requirements are not significant at rest

Answer 3

FALSE: even at rest, muscle uses energy

Question 4

How do actin and myosin proteins stain?

Answer 4

Acidophilically

Question 5

Define striated muscle

Answer 5

regular arrangement of actin and myosin filaments giving a highly ordered appearance

Question 6

What are the two types of striated muscle?

Answer 6

cardiac and skeletal

Question 7

TRUE or FALSE: cardiac muscles are involuntary

Answer 7

TRUE

Question 8

What cells are skeletal muscles derived from?

Answer 8

mesenchymal cells

Question 9

Describe Smooth Muscle

Answer 9

It is uninucleate, contracts slowly, and is found in the walls of tubular organs

Question 10

What are sarco- and myo-

Answer 10

Prefixes used for words that are referring to muscle (e.g. sarcoplasm=cytoplasm, sarcolemma=plasmalemma, etc.)