Which is the neurotransmitter that causes the release of calcium ions and initiates the steps of skeletal muscle fiber contraction?
A. Acetylcholine
B. Acetylcholinesterase
C. Norepinephrine
D. Serotonin
Answer: A
Anatomy & Physiology
You might also like to view...
What are the two subdivisions of the autonomic nervous system (ANS)?
a. superior and inferior b. sympathetic and parasympathetic c. spinal and limbs d. internal and external e. efferent and afferent
Anatomy & Physiology
Which of the following cells secretes CSF into the ventricles of the brain?
A) microglia B) basal nuclei C) ependymal cells D) substantia nigra
Anatomy & Physiology
The ________ cavity contains the lungs, which are enfolded in the ________
A) thoracic; pericardium B) abdominopelvic; pleurae C) thoracic; peritoneum D) thoracic; pleurae E) abdominopelvic; peritoneum
Anatomy & Physiology
Coronary vessels are open when the heart is
A. relaxed. B. contracting.
Anatomy & Physiology