Cardiac and Smooth Muscle Flashcards
In comparison to muscle cells dependent on anaerobic metabolism, cells using primarily aerobic metabolism would have
More mitochondria
More myoglobin
More cappillaries
More oxidative enzyme
Smooth muscles in integument system
Blood vessels, arrector pili muscles
Smooth muscles in cardiovascular system
Encircle blood vessels control distribution of blood, help regulate blood pressure
Smooth muscles in respiratory system
Contraction or relaxation alters diameters of respiration passageways
smooth muscle in digestive system
Control movement of materials through digestive tract
Smooth muscle in urinary system
Urinary bladder, ureters, kidney blood vessels
Smooth muscle in reproductive tract
Uterus
Rank the muscle tissue types in order of size
Skeletal
cardiac
smooth
What are desmosomes?
Provide structural attachment
What are gap junctions
Hold cells together with membrane channel proteins and allow bioelectrical current to flow from one cell to the next
Desmosomes and gap junctions are characteristics of
Cardiac muscle
What are intercalated disk?
Cell to cell attachment within cardiac muscle
How are smooth muscle myofilaments organized?
Thick filaments scattered throughout sarcoplasm
Thin filaments attached to dense bodies
Sliding of thick and thin filaments causes cell to shorten and twist
Define plasticity
Stretched muscle adapts to new length and retains ability to contract and produce tension
True or false contractions in smooth muscle can never be as powerful as those of skeletal muscles
False
