Around day 21 of development the primitive heart begins to beat. At this stage it contains the four chambers: two atria and two ventricles.
Answer the following statement true (T) or false (F)
False
When the heart begins to beat around day 21 it is composed of a single tube that is later partitioned into chambers (weeks 5 through 8).
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Aging begins in the fetus.
Answer the following statement true (T) or false (F)
Which of the following statements is true of both bone and cartilage?
a. They both contain more intercellular matrix than cells. b. Both bone and cartilage cells are supplied with food and oxygen through canaliculi. c. Both bone and cartilage cells are located in lacunae. d. Both A and C are true.
Vitamin D must be provided entirely by dietary sources
Indicate whether the statement is true or false
Bones that develop within tendons are called ________ bones
A) irregular B) sesamoid C) sutural D) Wormian E) tendon