Flashcards in NBS Physiology- Muscular Deck (19)
What structure stores Ca++ to be released to skeletal muscle?
B. Sacroplasmic reticulum
The "telephone line" of an AP into the muscle to cause calcium release from the sacroplamic reticulum is:
What is the ratio of actin to myosin:
This myofibril is thicker and prevalent in the ___ zone.
A. Myosin, I
B. Actin, I
C. Actin, H
D. Myosin, H
Calmodulin is required for _______ muscle contraction.
Which of the following blocks/covers F actin's binding site?
ATPase attaches to the ________ _______ in a cross bridge.
Which of the following binds to calcium and pulls Tropomyosin off the binding sited?
During muscular contraction the _____ Band get smaller while the ______ Band remains the same
T/F: Rigor mortis occurs after death because the formed crossbridges cant release
T/F: Troponin is found in smooth, skeletal and cardiac muscle
Not in smooth
Muscle lengthens when it contracts:
Muscle shortens when it contracts:
Alpha ventral root fibers are ________.
A motor unit is:
A. all the motor neurons and a single muscle fiber
B. a single motor neuron and a single muscle fiber innervated
C. a single motor neuron and all muscle fibers it innervates
D. All the motor neurons and all muscle fibers the innervate
A. H zone to H zone
B. Z line to I band
C. Z line to Z line
D. A band to A band
Z to Z
A band contains:
A. Only myosin
C. Both Actin and Myosin
D. Only Actin
The I band contains:
A. Both Actin and Myosin
B. Only Actin
C. Only Myosin