During the common pathway, what turns fibrinogen into fibrin?
A) thrombin B) prothrombin C) plasmin D) tissue factor
Answer: A
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The absolute refractory period of an action potential
A) ensures one-way travel down an axon and allows a neuron to ignore a second signal sent that closely follows the first. B) only allows a neuron to ignore a second signal sent that closely follows the first. C) only ensures one -way travel down an axon. D) only prevents summation of action potentials. E) ensures one-way travel down an axon, allows a neuron to ignore a second signal sent that closely follows the first, and prevents summation of action potentials.
Which part of the urinary system is not completely retroperitoneal?
a)kidneys b)ureters c)bladder d)nephrons
The folds of the internal membrane within mitochondria are called
A) cristae. B) cytosol. C) cisternae. D) matrix. E) histones.
The mesoderm forms
A) muscle. B) epidermis. C) the brain. D) the lining of the digestive tract. E) respiratory epithelium.