Osteoblasts involved in bone growth in length come primarily from
A. osteocytes.
B. chondrocytes.
C. endothelium of blood vessels.
D. connective tissue surrounding blood vessels of the endosteum.
E. periosteum.
Answer: D
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Which of the following is NOT an example of a cytoplasmic inclusion?
A. Actin filaments B. Lipid droplets C. Lipochrome D. Melanin E. Hemoglobin
The release of ____ from the hypothalamus stimulates the anterior pituitary to secrete TSH
a. TIH b. TRH c. TH d. PTH
As blood leaves the right ventricle, it passes through the ________ and then into the pulmonary trunk
A) pulmonary veins B) pulmonary valve C) aorta D) inferior vena cava E) superior vena cava
Guided by powerful signaling molecules, the human heart develops from
a. ectoderm and endoderm. b. ectoderm. c. blood cells. d. mesoderm. e. endoderm.