20 Questions
Where is cardiac muscle found?
Heart
What is the motility function of cardiac muscle?
Contraction of atria and ventricles
What is the cellular structure of cardiac muscle?
Mononucleated cells
What is the function of intercalated disks in cardiac muscle?
Contain gap junctions
What is the ratio of actin to myosin in cardiac sarcomeres?
3:1
What is the main energy metabolism pathway in cardiac muscle?
Oxidative metabolism
What is the effect of catecholamines on cardiac contraction?
Positive inotropy
How do cardiac action potentials differ from skeletal action potentials?
Different in different regions of the heart
How does cardiac muscle contraction differ from skeletal muscle contraction?
Contract coincident with action potential
Can cardiac muscle be tetanized?
No
Which type of muscle is innervated by the autonomic nervous system and is sensitive to hormones like epinephrine?
Cardiac muscle
Which type of muscle does not contract on its own and is insensitive to hormones on a short-time basis?
Skeletal muscle
Which type of muscle is found in the GI tract, vascular system, pulmonary system, skin, urinary tract, and reproductive system?
Smooth muscle
Which type of muscle has small distinct cells that are mononucleated and elongated in a 'football' shape?
Smooth muscle
Which type of muscle has no sarcomeres, no t-tubules, and rarefied SR?
Smooth muscle
Which type of muscle contracts in all dimensions as opposed to linear contraction in skeletal and cardiac muscle?
Smooth muscle
Which type of smooth muscle has cells that act independently and few gap junctions?
Multiunit smooth muscle
Which type of smooth muscle has cells that contract together and many gap junctions?
Single unit smooth muscle
Which type of muscle relies on Ca++ from outside and some from the SR for excitation-contraction coupling?
Smooth muscle
Which type of muscle requires dephosphorylation of myosin via phosphatase activity for relaxation?
Skeletal muscle
Test your knowledge of cardiac and smooth muscle with this quiz. Learn about the location and functions of cardiac muscle, as well as the role of smooth muscle in the body.
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