Which of the following shows the fine structure of a plasmalemma (cell membrane) and the details of intracellular structures?
A) light microscopy
B) ultrasound
C) transmission electron microscopy
D) magnetic resonance imaging
E) scanning electron microscopy
C) transmission electron microscopy
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Looking at the names of these muscles, which one would you expect to insert on the distal phalanges of toes 2-5?
A. Extensor pollicis longus B. Flexor digitorum longus C. Flexor hallucis longus D. Fibularis longus E. Tibialis anterior
Which catecholamines are secreted by the adrenal medulla? select all that apply.
a) dopamine b) melatonin c) serotonin d) norepinephrine e) epinephrine
Which statement regarding the cornea is not true?
A. The cornea lacks blood vessels (it is avascular). B. The cornea lacks nerves (it is aneural). C. The internal corneal epithelium obtains oxygen from fluid in the anterior chamber of the eye. D. The external corneal epithelium receives nourishment from lacrimal gland secretions. E. The cornea serves to refract light rays.
During contraction of a sarcomere,
a. the Z discs move farther apart b. the A bands become thicker c. the I bands become narrower d. the thin filaments become shorter e. events c and d occur