Which of the following are natural analgesics?
A. Endorphins
B. Dynorphins
C. Enkephalins
D. All of the choices are correct.
Answer: D
Anatomy & Physiology
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About two-thirds of the total blood volume is in the ________.
Fill in the blank(s) with the appropriate word(s).
Anatomy & Physiology
Cleavage occurs during
A. the pre-embryonic period. B. the embryonic period. C. fertilization. D. the fetal period. E. organogenesis.
Anatomy & Physiology
The heart is located in the space called the ________
A) abdominal cavity B) mediastinum C) pleural cavity D) myocardium E) pericardial cavity
Anatomy & Physiology
The fibrous tunic of the eye is composed of two parts. What are they?
A. The sclera and the retina B. The sclera and the uvea C. The cornea and the sclera D. The conjunctiva and the sclera E. The conjunctiva and the cornea
Anatomy & Physiology