Cardiac tissue Flashcards
What type of tissue cells are found in cardiac muscle tissue?
Striated: with sarcomeres
Compared to skeletal muscle, mitochondira of cardiac tissue are ____ and ____.
Larger, more plentiful
As with mitochondria, the ___ of cardiac cells are larger and more numerous than those of skeletal muscle.
Transverse tubules
Compared to skeletal muscle, which feature is less developed in the cardiac tissue?
sarcoplasmic reticulum
From where does the Ca++ used by cardiac sarcomeres come?
“Extracellular fluid (t-tubules)
Cisternae of sarcoplasmic reticulum”
How are cardiac cells described?
Short, branched with a single nucleus
How are cardiac cells connected?
intercalcated discs
T/F: each cardiac cell comes from a myoblast
False, cells originate from a single myoblast
A region consisting of numerous adherent junctions and numerous gap junctions
Intercalated disc
What is a desmosome?
structure that keeps the cells from pulling apart as they contract
What is the purpose of gap junctions?
Transmit contraction signal directly from cell to cell within the network
How many cellular networks are in the heart?
“two:
Upper = left and right atria
lower = left and right ventricles”
What is meant by functional syncytium?
all cells within a network contract as a single cell
