Question

The secondary ossification centers form in what part of the long bone? A. epiphysis B. diaphysis...

The secondary ossification centers form in what part of the long bone?

A.

epiphysis
B.

diaphysis
C.

metaphysis
D.

periosteum

In the presynaptic terminal of a motor neuron, synaptic vesicles release neurotransmitters in response to

A.

ligand gates Na+ channels opening
B.

voltage gated K+ channels opening
C.

ligand gated Ca+2 channels opening
D.

voltage gated Ca+2 channels opening

The motor protein in a sarcomere is the

A.

F-actin
B.

myosin
C.

G-actin
D.

Z-disk
E.

troponin

Once depolarization of the skeletal muscle fiber sarcolemma is complete, repolarization is achieved by

A.

K+ voltage gates opening
B.

Na+ voltage gates closing
C.

Na+ voltage gates opening
D.

K+ voltage gates closing
E.

A and B above
Science   Anatomy-And-Physiology   
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Homework Answers

Answer #1

1)The secondary ossification centers form in what part of the long bone?

  • answer:- A-epiphysis
  • solution:- the cartilage in the epiphysis continue to grow so the developing bone increase in length.

2) In the presynaptic terminal of a motor neuron, synaptic vesicles release neurotransmitters in response to?

  • answer:- D- voltage gated Ca+2 channels opening
  • Solution:- calcium channels interacting with the neurotransmitter containing vesicles leads to release of neurotransmitter into synaptic cleft.

3)The motor protein in a sarcomere is the?

  • answer:- z-disc
  • solution: the actin filaments physically anchored to structures at the end of each sarcomere called z- disc.

4)Once depolarization of the skeletal muscle fiber sarcolemma is complete, repolarization is achieved by?

  • answer:- E- A and B above.
  • Solution: repolarization is caused by K+ outward while the Na+ channels inactivates.
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