Phospholipids are important components of the plasma membrane. What does "B" represent on the diagram?
A. Polar (hydrophilic) region
B. Oxygen
C. Nonpolar (hydrophobic) region
D. Nitrogen
E. Phosphorus
Answer: C
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Of the ligaments associated with the vertebral column, which ligament would be seen most posteriorly on sagittal MR images below the level of the cervical region?
A. anterior longitudinal ligament (ALL) B. posterior longitudinal ligament (PLL) C. ligamentum flava D. ligamentum nuchae E. supraspinous ligament
Matching
A) Tetanus B) Maximal stimulus C) Wave summation D) Muscle tone E) Multiple motor unit summation 17) The stimulus above which no stronger contraction can be elicited, because all motor units are firing in the muscle. 18) Determined by alternating motor units of a muscle organ even when the muscle is at rest. 19) Continued sustained smooth contraction due to rapid stimulation. 20) The situation in which contractions become stronger due to stimulation before complete relaxation occurs. 21) How a smooth increase in muscle force is produced.
The main hormone secreted by the adrenal medulla in response to sympathetic stimulation is __________.
Fill in the blank(s) with the appropriate word(s).
When it is cold, the __________ contracts and draws the testes closer to the body to keep them warm.
A. cremaster muscle B. pampiniform plexus C. corpus spongiosum D. perineum E. corpus cavernosum