What causes striations in the cardiac muscle cells?
A) The overlapping of the actin and myosin proteins of the myofilaments
B) The abundance of mitochondria
C) The presence of myofibril contractile organelles
D) The presence of the intercalated discs
Answer: A
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What type of chemical messenger stimulates the cell that originally secreted it?
A. paracrine B. neurotransmitter C. autocrine D. endocrine
Which of these is commonly classified as a female secondary sex characteristic?
A. The ovary B. The uterus C. The distribution of body fat D. The vagina E. The labia majora
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