Describe the structures of a sarcomere
What will be an ideal response?
Sarcomeres, the smallest contractile units of a striated muscle cell, are segments of myofibrils. Each sarcomere has a dark A band and light I bands. The A band contains the M line, the H band, and the zone of overlap. Each I band contains thin filaments, but not thick filaments. Z lines mark the boundaries between adjacent sarcomeres.
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To which region of the stomach does the esophagus connect?
A) fundus B) cardia C) body D) antrum E) pyloric part
All of the following are true of epidermal ridges except that they
A) extend into the dermis. B) contain increased numbers of free nerve endings. C) cause ridge patterns on the surface of the skin. D) produce patterns that are determined genetically. E) interconnect with the dermal papillae.
The pelvic area is supplied with blood from the _______ arteries
Fill in the blank(s) with the appropriate word(s).
Which of the following statements using directional terminology is true?
A. The hand is distal to the elbow. B. The lungs are medial to the heart. C. The knee is proximal to the hip. D. The left ear is ipsilateral to the right eye.