MCBM Exam 3 Muscle Hovorka Flashcards
(28 cards)
What are the 2 characteristics of muscle?
contractile and conductive
What is contractile?
causes movement of the body and changes in the size/shape of internal organs
What is conductive?
skeletal muscle is a major source of body heat (by product of cellular respiration)
What are the 3 types of muscle?
smooth
cardiac
striated
What are some characteristics of skeletal muscle and where is it found?
muscles of skeleton and some viscera (tongue, esophagus) somatic ands striated
What are characteristics of cardiac muscles?
heart, autonomic, striated
What are characteristics of smooth muscle?
walls of viscera, blood vessels, and skin, autonomic, and not striated
Is skeletal multinucleated?
yes
Is cardiac multinucleated?
no has a single nucleus
Where is the nucleus located in the cardiac muscle?
centrally
Where is the nucleus located in the skeletal muscle?
located peripherally
What is the skeletal muscle organization?
muscle muscle fascicle muscle fibre myofibrils myofilaments
What is the muscle cell called?
a muscle fibre
What connective tissue is associated with skeletal muscle?
epimyseum, perimyseum
endomyseum
What is endomyseum?
reticular fibers that surround individual muscle fibers
What is perimyseum?
thicker connective tissue surrounding muscle fascicles and there are blood vessels and nerves within it
What are myofibrils?
repeating sarcomeres, contractile element of the cell, extend the entire length of the muscle fiber
Where does the sarcomere extend to and from?
from Z line to Z line
Where is the M line?
in the middle
Does the A band change in length during contraction?
no
What are the thin filaments?
actin, tropomyosin, troponin
What are the thick filaments?
myosin
What are 2 characteristics of thick filaments?
2 heavy chains (rods and head), 4 light chains (regulatory)
What are some other notable components of a muscle fiber?
sarcoplasmic reticulum, T tubule, nuclei, mitochondria
