Ch 10 Flashcards
Three types of muscle tissue
Skeletal, cardiac, smooth
Three types of muscle tissue
Skeletal, cardiac, smooth
Purpose of skeletal muscle
Converting the chemical energy in ATP into mechanical energy of motion
What does Myo mean
Muscle
What are sphincters
Control the opening pathways
Glycemic control
Muscles absorb and store glucose which helps regulate blood sugar within a normal range
Striations
Lots of small stripes. Results from the arrangement of internal contractile proteins
Can muscle cells divide?
No, too many nucleus’s
Sarcolemma
Plasma membrane
Projections around sarcolemma
Transverse(T) tubules. Allows for an action potential
Myofibrils
Bundles of myofilaments. Pencils w a rubber band around it. Within the sarcoplasm
What things are inside the sarcoplasm
Myofibrils, glycogen, myoglobin(store protein in muscle for oxygen)
Sarcoplasmic reticulum
Verizion of smooth ER. Stores calcium. Calcium is released when there is an action potential. Takes it up once we’ve done contracting our muscles
What are terminal cisternae
Dilated end sacs of the SR
Myosin
Thick filaments of myofilaments.
Actin
Thin filaments of myofilaments. Two intertwine to form fibrous actin. If individual subunit, globular actin.
What do we use to regulate the sites on actin where myosin head wants to interact
Troponin and tropomyasin
To make the active sites open, we need
what type of muscle doesn’t have striations?
smooth
which type of muscle has a butt ton of glycogen
cardiac. this way u don’t die
which muscle type has intercalated discs
cardiac
which muscle type is uninucleus
smooth
myopathies
muscle disease
muscular dystrophy
muscles degenerate and replaced w scar and adipose tissue. no dystrophin so when shortening cell it’s without the sarcolemma. Hereditary.
Myasthenia gravis (MG)
Autoimmune diseas where the antibodies distroy the asytel coline(ACh) receptors. Shows in facial muscles. Eyelid droops. Trouble swallowing, limb weakness
