Muscular System | HAP | PRELIMS

Which of the following is NOT a function of the muscular system?

Where are smooth muscles located?

What muscle does the heart have?

What is the skeletal muscles' cell shape?

This muscle has a spindle-shaped cell

Cardiac muscle has a ____ Cell shape

These muscles' nucleus are usually single EXCEPT one

This muscle has a cell-to-cell attachment

Intercalated disks

Connective tissue that surrounds a fascicle

Connective tissue that surrounds the entire muscle

Endomysium is the connective tissue that surrounds an
individual muscle fiber

The cell membrane of the muscle fiber; where
the multiple nuclei of the muscle fiber are deeply located

tubelike invaginations

the cytoplasm of the muscle fiber

Mitochondrion is the highly organized endoplasmic
reticulum of the muscle fiber

A cylindrical bundle of contractile
myofilaments

Complete the analogy:

Kasiyahan;pera :: pera ko; ubos na
actin filaments; ___ :: myosin filaments; ___

The Sacromere is the basic structural and functional
unit of SKELETAL muscle

Light band which consists only of actin myofilaments

Located at the center of
each sarcomere

Dark, central region in each
sarcomere

Where the myosin myofilaments are
anchored or held in place

Neuromuscular Junction chronological order (punyeta ano toh ?!?!?!?)

I: An action potential arrives at the presypnatic terminal, causing Ca²+ channels to open

II: Calcium Ions ( Ca²+ ) enter the presypnatic terminal and initiate the release of a
neurotransmitter, acetylchoine ( ACh ), from sypnatic vesicles into the presypnatic cleft

III: Sodium lons (Na) diffuse down their concentration gradient, which results in depolarization
of the muscle fiber membrane; once threshold has been reached, a postsynaptic action potential results.

IV: Diffusion of ACh across the synaptic cleft and binding of ACh to Ach receptors on the
postsynaptic muscle fiber membrane opens Na+ channels.

The ff. are true about muscle contraction EXCEPT

Choose the correct power stroke process

I: As myosin heads bind ATP, the cross-bridges detach from actin
II: Myosin heads bind to actin, forming cross-bridges
III: Myosin cross-bridges rotate toward center of
sarcomere
IV:Myosin heads hydrolyze ATP
and become reoriented and energized

How many skeletal muscles are in the human body?