Question

When considering the gross histology of a muscle, which tissue layer is areolar connective tissue?

	A.	perimysium
	B.	fascia
	C.	endomysium
	D.	epimysium

The band in the center of a sarcomere where there is only myosin present is the

	A.	H-band
	B.	A-band
	C.	I-band
	D.	Z-disk

Bone matrix forming cells are

	A.	chondroclasts
	B.	chondroblasts
	C.	osteoblasts
	D.	osteocytes
	E.	osteoclasts

In skeletal muscle fibers, depolarization is achieved by

	A.	K+ voltage gates opening
	B.	Na+ voltage gates closing
	C.	Na+ voltage gates opening
	D.	K+ voltage gates closing

Answer 1

Answer

1. Option C) Endomysium

• Endomysium is a connective tissue covering for an individual skeletal muscle fiber.
• It is made up of areolar connective tissue.

2. Option A) H band

• H band contains only myosin filaments (thick filaments).
• The center of H band is M line.

3. Option C) Osteoblasts

• Osteoblasts are bone forming cells.
• Secretion of calcitonin increases osteoblastic acitivity.

4. Option C) Na⁺ voltage gates opening

• When acetylcholine binds to its receptors on motor end plate, ligand gated voltage channels open. Na+ influx depolarizes the sarcolemma.
• As the depolarization proceeds, viltage gated Na+ channels open to depolarize entire skeletal muscle.