Bio 201
Question 1
Choose all characteristics that apply to the microscopic structure of cardiac muscle.
Cells are striated
Cells never branch
Cells have multiple nuclei located close to the sarcolemma
Composed of cardiomyocytes
Cells are branched
Cells have one or two centrally located nuclei
Cells are loosely attached
Cells have smooth appearance
Question 2
Choose all that apply to characteristics of smooth muscle.
Sarcomeres are present
Cross-bridging between myosin and actin is regulated by tropomyosin
Calcium ions are supplied by sarcoplasmic reticulum only
Cross-bridging between myosin and actin is regulated by calmodulin
Calcium ions are supplied by sarcoplasmic reticulum and interstitial fluid
Only myosin filaments are present
No sarcomeres
Presence of myosin and actin filaments
Question 3
Contraction of smooth muscle is caused by all of the following EXCEPT:
hormones
impulses from somatic nervous system
local factors
stretching
stimulation by autonomic nervous system
Question 4
Match the description with the type of muscle tissue
Intercalated disks are present in
Striations are present in
No striations in
Varicosities are present in smooth muscle
All Answer Choices
A. skeletal muscle
B. skeletal and smooth muscle
C. cardiac and skeletal muscle
D. cardiac muscle
E. smooth muscle
Question 5
Match the type of muscle tissue with the type of contraction
Smooth muscle contraction cause
Cardiac muscle contraction cause
Smooth muscle contraction strength
Skeletal muscle contraction cause voluntary
All Answer Choices
A. involuntary but not autorhythmic
B. involuntary and autorhythmic
C. voluntary
D. strong
E. weak
