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BIOL 252 Module 2 Questions and Answers 100%
Verified
Cardiovascular System - ANSWER Network of heart, blood, and
vessels that circulates oxygen, nutrients, and waste.
Myocardium - ANSWER Cardiac muscle tissue found only in the
heart.
Autorhythmicity - ANSWER Ability of cardiac muscle to generate
its own electrical impulses.
Myocardial Contractile Cells - ANSWER Cells responsible for
pumping blood through contraction (99% of heart cells).
Myocardial Conducting Cells - ANSWER Cells that create and
transmit electrical impulses (1% of heart cells).
Purkinje Cells - ANSWER Specialized conducting cells that
rapidly spread impulses through ventricles.
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Cardiomyocyte - ANSWER Cardiac muscle cell; short, branched,
usually one nucleus.
Sarcomere - ANSWER Contractile unit of muscle from Z-line to
Z-line.
Z-Line - ANSWER Boundary of sarcomere where thin filaments
anchor.
A Band - ANSWER Dark band in striated muscle containing thick
filaments.
I Band - ANSWER Light band containing thin filaments.
Myofibril - ANSWER Long fiber within muscle cell containing
many sarcomeres.
T-Tubules - ANSWER Sarcolemma extensions carrying action
potentials into cell interior.
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Cardiac T-Tubules - ANSWER Located only at Z-lines in
cardiomyocytes.
Sarcoplasmic Reticulum (SR) - ANSWER Organelle storing
calcium; limited storage in cardiac cells.
M Line - ANSWER Region holding thick filaments at center of
sarcomere.
H Band - ANSWER Sarcomere region with only thick filaments;
narrows during contraction.
Gap Junctions - ANSWER Channels allowing ions to pass
between cells for synchronized contraction.
Desmosomes - ANSWER Structures binding cells together to
withstand contraction forces.
Intercalated Discs - ANSWER Junctions between cardiac cells
containing desmosomes and gap junctions.
BIOL 252 Module 2 Questions and Answers 100%
Verified
Cardiovascular System - ANSWER Network of heart, blood, and
vessels that circulates oxygen, nutrients, and waste.
Myocardium - ANSWER Cardiac muscle tissue found only in the
heart.
Autorhythmicity - ANSWER Ability of cardiac muscle to generate
its own electrical impulses.
Myocardial Contractile Cells - ANSWER Cells responsible for
pumping blood through contraction (99% of heart cells).
Myocardial Conducting Cells - ANSWER Cells that create and
transmit electrical impulses (1% of heart cells).
Purkinje Cells - ANSWER Specialized conducting cells that
rapidly spread impulses through ventricles.
,2|Page
Cardiomyocyte - ANSWER Cardiac muscle cell; short, branched,
usually one nucleus.
Sarcomere - ANSWER Contractile unit of muscle from Z-line to
Z-line.
Z-Line - ANSWER Boundary of sarcomere where thin filaments
anchor.
A Band - ANSWER Dark band in striated muscle containing thick
filaments.
I Band - ANSWER Light band containing thin filaments.
Myofibril - ANSWER Long fiber within muscle cell containing
many sarcomeres.
T-Tubules - ANSWER Sarcolemma extensions carrying action
potentials into cell interior.
, 3|Page
Cardiac T-Tubules - ANSWER Located only at Z-lines in
cardiomyocytes.
Sarcoplasmic Reticulum (SR) - ANSWER Organelle storing
calcium; limited storage in cardiac cells.
M Line - ANSWER Region holding thick filaments at center of
sarcomere.
H Band - ANSWER Sarcomere region with only thick filaments;
narrows during contraction.
Gap Junctions - ANSWER Channels allowing ions to pass
between cells for synchronized contraction.
Desmosomes - ANSWER Structures binding cells together to
withstand contraction forces.
Intercalated Discs - ANSWER Junctions between cardiac cells
containing desmosomes and gap junctions.
