Which of the following correctly describes an erection?
A) The spongy tissue in the penis fills with air.
B) Parasympathetic neurons release nitric oxide causing dilation of small arteries in the
penis.
C) Smooth muscles of vascular spaces in the penis contract.
D) Parasympathetic impulses constrict arteries leading to the penis.
B
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The areolar connective tissue found immediately beneath the epithelium of the digestive tract is called
A) mucosa. B) plica. C) lamina propria. D) basement membrane. E) All of the answers are correct.
The epidermal layer whose cells have stopped dividing and started to produce large amounts of keratin is the
A) stratum corneum. B) stratum lucidum. C) stratum basale. D) stratum granulosum. E) stratum spinosum.
Which of the following types of bonding is characterized by two or more atoms sharing electrons to fill their outer shells?
A. Charged bond B. Ionic bond C. Hydrogen bond D. Covalent bond
What connects the stereocilia in a hair bundle?
A. calcium channels B. tip links C. spiral ligaments D. outer hair cells