Chapter 10 Muscle Tissue Flashcards
True or false? Phospholipids are a form of energy for the body?
False
What is the strongest of the cell junctions?
Desmosomes
What junctions contains fluid filled channels for intracellular communication
Gap junctions
True or false? Synovial membrane is NOT a type of epithelial membrane?
True
What are the characteristics of skeletal muscle?
Multi nucleated, striated and voluntary
What are the characteristics of cardiac muscle tissue?
One nucleus, striated, intercalated discs, involuntary
What are the features of visceral smooth muscle?
One nucleus, no striations, involuntary
What is epimysium
Dense irregular connective tissue, outer layer encircling the whole muscle
Perimysium
Dense irregular, surrounds bundles of 10-100 cells forming fascicles
Endomysium
Reticular, separates each individual muscle diver from each other
What are Transverse tubules
Thousands of invaginations of the sarcolemma toward the centre of muscle cell. They are filled with extracellular fluid allowing for the instant stimulation of all parts of the cell simultaneously with the same stimulus
Sarcoplasmic reticulum (SR)
Membranous sacs encircling each myofibril. The dilated ends of the SR are called terminal cisterns
Stores calcium ions for the muscle contraction
What is a triad formed by?
A T tubule and two terminal cisterns
Thin filaments are composed of?
Actin
Thick filaments are composed of?
Myosin
Z disc
Narrow plate-shaped regions of dense proteins that separates each sarcomere from each other
Sarcomere
Basic functional unit of a myofibril that are arranged in compartments
Myofibril
Contractile organelles that contain myofilaments
A band
Dark middle part of sarcomere that extends entire length of thick filaments and includes those parts of thin filaments that over lap the thick
I band
Lighter less dense area of sarcomere that contains remainder of thin filaments but NO thick filaments
A Z disc passes through centre of each I band
H zone
Narrow region in centre of each A band that contains thick filaments but no thin filaments
M line
Region in centre of H zone that contains proteins that hold thick filaments together at centre of sarcomere
What are the contractile proteins
Myosin
Actin
What are the regulatory proteins
Troponin
Tropomyosin
