Cardiac Muscle Physiology Ultimate Exam 3 Questions and Answers with Verified Solutions | Latest Updated 2026

Cardiac Muscle Physiology Ultimate Exam 3
Questions and Answers with Verified
Solutions | Latest Updated 2026



cardiac muscle is striated, branched, interconnected



cardiac muscle has __ nucleus one



the cell membrane of cardiac sarcolemma
muscle
is called


what is the specialized smooth ER sarcoplasmic reticulum
of
cardiac muscle


is cardiac muscle involuntary or involuntary
voluntary


what are intercalated disc junctions between cells that anchor cardiac
cells


what are the 2 types of desmosomes
intercalated gap junctions
disc

, function of desmosomes prevent cells from separating during
contraction


function of gap junctions - allow ions to pass from cell to cell
- allows heart to be functional syncytium
(behave
as one single coordinated unit)


what are T tubules invaginations of the sarcolemma that
transmit
action potenitals into the cell


T tubules contain large amounts of mitochondria



whats the essential difference in cardiac requires extracellular Ca
contraction coupling between (no Ca no contraction of the heart)
cardiac and skeletal


actin is thin



myosin is thick



how does heart muscle contract thin actin filaments slide over thick myosin
filaments towards the M line, this pulls the
Z lines
behind them which shortens the
sarcomere