Podcast
Questions and Answers
Where is cardiac muscle found?
Where is cardiac muscle found?
- GI tract
- Heart (correct)
- Tongue
- Bones and joints
What is the motility function of cardiac muscle?
What is the motility function of cardiac muscle?
- Pacing in SA node
- Conduction of electrical activity
- Contraction of atria and ventricles (correct)
- Closing of valves
What is the cellular structure of cardiac muscle?
What is the cellular structure of cardiac muscle?
- Mononucleated cells (correct)
- Branching strands
- Large multinucleated cells
- Contain gap junctions
What is the function of intercalated disks in cardiac muscle?
What is the function of intercalated disks in cardiac muscle?
What is the ratio of actin to myosin in cardiac sarcomeres?
What is the ratio of actin to myosin in cardiac sarcomeres?
What is the main energy metabolism pathway in cardiac muscle?
What is the main energy metabolism pathway in cardiac muscle?
What is the effect of catecholamines on cardiac contraction?
What is the effect of catecholamines on cardiac contraction?
How do cardiac action potentials differ from skeletal action potentials?
How do cardiac action potentials differ from skeletal action potentials?
How does cardiac muscle contraction differ from skeletal muscle contraction?
How does cardiac muscle contraction differ from skeletal muscle contraction?
Can cardiac muscle be tetanized?
Can cardiac muscle be tetanized?
Which type of muscle is innervated by the autonomic nervous system and is sensitive to hormones like epinephrine?
Which type of muscle is innervated by the autonomic nervous system and is sensitive to hormones like epinephrine?
Which type of muscle does not contract on its own and is insensitive to hormones on a short-time basis?
Which type of muscle does not contract on its own and is insensitive to hormones on a short-time basis?
Which type of muscle is found in the GI tract, vascular system, pulmonary system, skin, urinary tract, and reproductive system?
Which type of muscle is found in the GI tract, vascular system, pulmonary system, skin, urinary tract, and reproductive system?
Which type of muscle has small distinct cells that are mononucleated and elongated in a 'football' shape?
Which type of muscle has small distinct cells that are mononucleated and elongated in a 'football' shape?
Which type of muscle has no sarcomeres, no t-tubules, and rarefied SR?
Which type of muscle has no sarcomeres, no t-tubules, and rarefied SR?
Which type of muscle contracts in all dimensions as opposed to linear contraction in skeletal and cardiac muscle?
Which type of muscle contracts in all dimensions as opposed to linear contraction in skeletal and cardiac muscle?
Which type of smooth muscle has cells that act independently and few gap junctions?
Which type of smooth muscle has cells that act independently and few gap junctions?
Which type of smooth muscle has cells that contract together and many gap junctions?
Which type of smooth muscle has cells that contract together and many gap junctions?
Which type of muscle relies on Ca++ from outside and some from the SR for excitation-contraction coupling?
Which type of muscle relies on Ca++ from outside and some from the SR for excitation-contraction coupling?
Which type of muscle requires dephosphorylation of myosin via phosphatase activity for relaxation?
Which type of muscle requires dephosphorylation of myosin via phosphatase activity for relaxation?
