Myasthenia gravis is a disease that is believed to be caused by autoimmune disorder, resulting in the loss of ACh receptors at the motor end plate of muscle fibers. Which of the following is likely to be a symptom of myasthenia gravis?
A) dehydration with headache
B) weakness of muscle
C) seizures and uncontrollable muscle movement
D) coma and loss of voluntary muscle movement
B
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Which factor would reduce the net filtration pressure the most?
a. vasodilation of the afferent arteriole. b. vasoconstriction of the efferent arteriole. c. a large increase in blood colloid osmotic pressure. d. a low capsular hydrostatic pressure. e. a high glomerular hydrostatic pressure.
The tissue that is usually well vascularized and has an extensive extracellular matrix is called ________
A) epithelial tissue B) connective tissue C) nervous tissue D) muscle tissue E) brain tissue
The flexor pollicis longus muscle originates on the medial epicondyle of the humerus
Indicate whether this statement is true or false.
A motor unit refers to
a. a single motor neuron plus all of the muscle fibers it innervates. b. a single muscle fiber plus all of the motor neurons that innervate it. c. all of the motor neurons supplying a single muscle. d. a pair of antagonistic muscles. e. a sheet of smooth muscle cells connected by gap junctions.