6.5 and 11.2 Brains and Muscles

Attachment for myosin, located in the middle of a sarcomere.

• Z disc

• I band

• M line

• A band

Basic functional unit of skeletal muscle

• M line
• Sarcomere
• H zone
• Z disc

Anchors actin filaments 

• Z disc
• H zone
• A band
• I band

Contains myosin and overlapping actin filaments

• H zone 
• I band 
• Z disc
• A band

What is released from the scaroplasmic reticulumn  and is required to get the myosin binding sites exposed (on an actin filament)?

• Sodium
• Potassium
• Calcium
• acetylcholine

Which statement is true:
Acetylcholine is involved in:
a)Diffusing across the synaptic cleft from the axon terminal
b) Binding to receptors and ligand channels
c) Acetylcholine initiates the action potential (AP) in a muscle fibre
d) All of the above

• A
• B
• C
• D

Once the action potential has traveled along the sacrolemma, what structure takes the action potential into the interior of the muscle fibre?

• T- tublues
• Sacroplasmic reticulum
• Mitochondria
• Sacroplasm

What is the role of calcium in the cross bridge cycle ?

• Attaching to Troponin on the actin filament, causing a shape change. The Tropomyosin exposes the actin attachment site for myosin.
• It attaches straight to Tropomyosin on the myosin filament. 
• The calcium attaches to both Troponin and Tropomyosin at the same time, connecting the actin and myosin filaments
• Calcium is only required after the Tropomyosin has allowed myosin to bind to the exposed actin sit on the thin filament

True or False:
Acetylcholinesterase is an enzyme that breaks down Acetylcholine into two different parts.

• True
• False

Tags

NGSS.HS-PS1-2

Which is the correct sequence in the transmission of a neural impulse?

• axon, dendrite, cell body, synapse
• dendrite, axon, cell body, synapse
• synapse, axon, dendrite, cell body
• dendrite, cell body, axon, synapse