A biology student accidentally loses the labels of two prepared slides she is studying. One is a slide of an intestine; the other is a slide of an esophagus. You volunteer to help her sort them out. How would you decide which slide is which?
What will be an ideal response?
Because animal intestine is modified for absorption, you would look for a slide that shows a single layer of epithelium lining the cavity. The cells would be cuboidal or columnar and would probably have microvilli on the surface to increase surface area. Because the esophagus receives undigested food, it would have a stratified epithelium consisting of squamous cells to protect it.
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Smooth muscle cells
A) have to be innervated by motor neurons. B) are larger than cardiac muscle cells. C) are multinucleate. D) contain intercalated discs. E) are spindle-shaped.
The inability to reach out and touch an object with control and accuracy may result from damage to the ______
Fill in the blank(s) with the appropriate word(s).
This figure shows a frontal view of a human. What does number 5 indicate?
A. Pelvic cavity B. Abdominal cavity C. Mediastinum D. Pleural cavity E. Pericardial cavity
Why is the vascularization of the nasal cavity important?
A) The rich collection of blood vessels allows the incoming air to be filtered of large particles before it leaves the nasal cavity. B) The rich collection of blood vessels allows the white blood cells to attract and destroy pathogens in incoming air before it leaves the nasal cavity. C) The rich collection of blood vessels allows the incoming air to be warmed and humidified before it leaves the nasal cavity. D) The rich collection of blood vessels allows blood temperature to equalize with external temperatures. E) The rich collection of blood vessels drains excess interstitial fluid into the surrounding nasal passageways as a way to increase mucus production.