Following ejaculation in a healthy adult, approximately 300 ...

[arivle123]

Following ejaculation in a healthy adult, approximately 300 million sperm is present. Which percent of these sperm would be considered normal (mobile and morphologically healthy) and able to fertilize an egg?
 
  A)
  95
  B)
  75
  C)
  55
  D)
  45

Question 2

During pathophysiology class, a nursing student asks the faculty what purpose do the osteoprogenitor cells serve. From the following list, identify the purpose of these cells. Select all that apply.
 
  A)
  Formation of red blood cells
  B)
  Growth and remodeling of bone
  C)
  Anchorage point for blood vessels
  D)
  Repair of bone
  E)
  Supply nerves to the bone matrix

[jesse.fleming]

Answer to Question 1

Ans:
C

Feedback:

Approximately 3 mL of semen is expressed with each ejaculate, and each milliliter is made up of about 100 million sperm. However, approximately 20 of the sperm in any ejaculate are not morphologically normal and about 25 are immobile.

Answer to Question 2

Ans:
B, D

Feedback:

The endosteum is the membrane that lines the spaces of spongy bone, the marrow cavities, and the haversian canals of compact bone. It is composed mainly of osteoprogenitor cells that contribute to the growth and remodeling of bone and are necessary for bone repair. The osteons consist of concentric lamellae of the bone matrix, surrounding a central canal, called the Haversian canal that contains blood vessels and supply nerves to the bone matrix. The periosteum acts as an anchorage point for blood vessels to enter and leave the bone. RBC formation occurs in the shaft of long bones.