The artery that bifurcates into the right subclavian artery and the right common carotid artery is the
A. brachiocephalic artery.
B. right common iliac artery.
C. right brachial artery.
D. right coronary artery.
E. superior vena cava.
A
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Why does exposure to sunlight or sunlamps darken skin?
A) UV radiation stimulates melanocytes to produce more melanin. B) UV radiation stimulates melanocytes to produce more melatonin. C) UV radiation stimulates keratinocytes to produce more carotene. D) UV radiation stimulates keratinocytes to produce more keratin. E) UV radiation stimulates melanocytes to produce more melanin and keratinocytes to produce more keratin.
When a clot is no longer needed, fibrin is dissolved by ________.
A. plasmin B. thromboplastin C. platelet-derived growth factor D. prothrombin E. kallikrein
The germ layer between the ectoderm and the endoderm is the __________
Fill in the blank with correct word.
Nociceptors are responsible for the perception of
A) itch only. B) pain only. C) pain and itch. D) skin stretch only. E) pain and skin stretch.