What part of the nervous system controls the body's voluntary activities?
A. central
B. sensory
C. somatic
D. autonomic
Answer: C. somatic
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The flagellum is used to
A) penetrate the corona radiata. B) survive. C) move the sperm to the oocyte. D) penetrate the oocyte. E) become capacitated.
Where in the embryo does mesoderm first appear?
A) between the cell layers of the inner cell mass B) within the blastocoele C) in the chorionic villi D) above the epiblast E) around the trophoblast
The membrane that lines the digestive, respiratory, urinary, and reproductive tracts consists of
A. areolar and dense irregular connective tissue B. areolar tissue and lamina propria C. epithelium and lamina propria D. simple squamous epithelium and areolar tissue E. simple squamous epithelium and dense irregular connective tissue
During a biology lab, Erin used a cotton swab to remove some tissue from the inner side of her cheek. She then placed the tissue on a slide to examine it under the microscope. Why was the tissue able to be removed so easily without causing injury to the rest of Erin's cheek?
a. The tissue contained abundant amounts of ground substance to keep the tissue puffy and relatively intact. b. The tissue contained multiple layers of cells, so removing a few cells wouldn't harm the rest of the tissue. c. The tissue contained lots of blood vessels, so blood filled any gaps left when the original cells were removed. d. The remaining cells were interconnected by intercalated discs, which formed a strong bond between the cells.