A splinter penetrated into the skin on the palmar surface of the hand. The splinter nearly reached stratum basale of the epidermis. What is the final layer injured by this splinter?
A) stratum spinosum of the epidermis B) stratum lucidum of the epidermis
C) stratum granulosum of the epidermis D) stratum corneum of the epidermis
Answer: A
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Which structural feature of the scapula articulates with the humerus?
A) supraspinous fossa B) subscapular fossa C) acromion D) coracoid process E) glenoid cavity
________ opens up one segment of the DNA helix during replication; ________adds complementary free nucleotides to the exposed DNA strand.
A. DNA helicase; DNA polymerase B. DNA helicase; DNA ligase C. DNA ligase; DNA polymerase D. DNA polymerase; DNA ligase E. DNA ligase; DNA helicase
Which of the following statements concerning the cardiac cycle is true?
A. Blood enters the right and left atria only during diastole. B. During ventricular systole, the AV valves open. C. The semilunar valves remain closed throughout ventricular systole. D. Most of end-diastolic volume comes from active filling. E. Most ventricular filling occurs before the atria contract.
For relaxation to occur,
A. ACh receptors open and Ca++ channels on the sarcoplasmic reticulum close. B. ACh receptors close and Ca++ channels on the sarcoplasmic reticulum open. C. ACh receptors close and Ca++ channels on the sarcoplasmic reticulum close. D. ACh receptors open and Ca++ channels on the sarcoplasmic reticulum open.