Describe the three phases of the normal blood-clotting process
What will be an ideal response?
Hemostasis involves three major phases. The first phase is the vascular spasm phase, in which serotonin released by the platelets causes the blood vessels to spasm and constrict, thus decreasing blood loss. The second phase is the platelet plug formation, in which platelets become "sticky" and cling to the site of injury. The third phase is coagulation wherein thromboplastin interacts with PF3 (platelet factor 3 ) and calcium, as well as other blood proteins, to form prothrombin activator. Prothrombin activator converts prothrombin to thrombin, which then joins with fibrinogen to form fibrin, the basis of the clot.
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The most laterally placed of the three erector spinae components, the ________ group, is composed of three parts: cervical, thoracic, and lumbar.
A. spinalis B. longissimus C. iliocostalis
The ________ valve regulates the flow of blood between the right ventricle and the vessels leading to the lungs.
A. left atrioventricular B. mitral C. right atrioventricular D. pulmonary E. aortic
Where does the cell body of the preganglionic neuron originate?
A) target cell B) peripheral nervous system (PNS) C) central nervous system (CNS) D) postganglionic neuron
Which of the following is NOT known to be an important neurotransmitter in the CNS?
A. Dopamine B. Acetylcholine C. Morphine D. Glutamate E. Substance P