Fertilization stimulates the oocyte to enter meiosis II and the fertilized oocyte is called a(n)
A) oogonium.
B) primary oocyte.
C) secondary oocyte.
D) ovum.
E) polar body.
D
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Identify the structures labeled "4."
A) concentric lamellae B) circumferential lamellae C) interstitial lamellae D) trabeculae E) periosteum
Why is it that one cannot identify the location of internal organs, although joints and bone location can be identified?
A) The internal organs have no proprioceptors like joints, bones, and muscles. B) Internal organs have no pain receptors. C) Although internal organs have some receptors, the information is not interpreted by the brain. D) Internal organs have no receptors of any kind. E) Sensory information from internal organs is processed by a different part of the brain than the joints, bones, and muscles.
In meiosis the spermatozoa that are produced are genetically unlike each other and unlike the cell that produces them. This is one reason for the great variation among humans. What causes this effect?
A) chromosome segregation and independent assortment only B) crossing-over and chromosome segregation only C) crossing-over and independent assortment only D) crossing-over, chromosome segregation, and independent assortment
All of the following veins drain into the inferior vena cava EXCEPT the ________
A) lumbar veins B) external iliac vein C) gonadal veins D) adrenal veins