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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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 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
Which muscle is used when giving your grandmother a kiss on the cheek?
A) Orbicularis oculi B) Orbicularis oris C) Buccinator D) Masseter
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.