Formed primarily of tunica intima and strengthened by elastic and collagen fibers, the _________________ in veins prevent blood from pooling
Fill in the blank with correct word.
valves
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The main pacemaker of the heart is the __________.
Fill in the blank(s) with the appropriate word(s).
Which bone articulates with all three cuneiform bones?
A. Navicular B. Talus C. Cuboid D. First metatarsal E. Calcaneus
While standing, if you bend at the waist to touch your toes, which muscle would you use to stand back up straight again?
A. Erector spinae B. Rectus abdominis C. External abdominal oblique D. Rectus femoris E. Sternocleidomastoid
In activated platelets, arachidonic acid is converted to ________, which ________ formation of blood clots.
A) prostacyclin : inhibits B) thromboxane A2 : inhibits C) nitric oxide : inhibits D) prostacyclin : stimulates E) thromboxane A2 : stimulates