Of the steps in excitation-contraction below, which step occurs before the others?
a. Exposed actin sites bind with myosin cross bridges.
b. Sodium channels open in the fiber's membrane.
c. Calcium is released from the sarcoplasmic reticulum.
d. Troponin binds calcium.
e. Attachment of ATP allows for cross bridge detachment.
B
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Skeletal muscle is described as __________.
A. striated and voluntary B. striated and involuntary C. nonstriated and voluntary D. nonstriated and involuntary E. fibrous and containing ground substance
Which of the following neuroglia are not part of the CNS?
A. Astrocytes B. Satellite cells C. Microglia D. Ependymal cells
Why does a fracture of the clavicle usually occur in the mid-region of the bone?
a) Due to the medial pressure from the inflated lungs b) Due to the ligament-reinforced strength of the acromial joint c) Due to weakness at the junction of the two curves of clavicle d) Due to position of the clavicle relative to the humerus e) Due to fusion of the ends of the clavicle to the sternum and scapula
The conversion of glucose to galactose would be catalyzed by an isomerase enzyme.
Answer the following statement true (T) or false (F)