The enzyme renin is responsible for the activation of
A) angiotensin I.
B) cortisol.
C) erythropoietin.
D) atrial natriuretic peptide.
E) adrenaline.
Answer: A
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The structure in which cells repeatedly divide to produce new cells that form a hair is the
A. hair matrix. B. Merkel region. C. hair shaft. D. lunula.
Which structures are responsible for creating a direct electrical connection between cardiac muscle cells?
A) gap junctions B) maculae adherens C) intercalated discs D) desmosomes E) fascia adherens
In connective tissue, the role of elastic fibers is to __________
A. provide flexibility B. retain fluid C. form delicate networks around blood vessels D. provide tensile strength
Which muscle is used when giving your grandmother a kiss on the cheek?
A) Orbicularis oculi B) Orbicularis oris C) Buccinator D) Masseter