Describe the series of events that occurs during a normal clotting mechanism. How is this interrupted in persons with hemophilia A?
What will be an ideal response?
After there is a break in a blood vessel, the vessel itself constricts by the action of smooth muscle cells in the walls of the vessel. Platelets release seratonin that results in the muscular contraction. Platelets also stick to the inside of the vessel, beginning the clot formation. Then the injured cells release activators, which cause prothrombin to be converted into thrombin, which is an enzyme that changes fibrinogen (normally circulating in the blood) to fibrin. Fibrin is a tough insoluble fibrous protein. These create the blood clot. Persons with hemophilia A lack a gene that produces one of the proteins in this series of steps, and therefore lack normal clotting mechanisms.
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In eukaryotes, photosynthesis takes place inside the ________.
A. chloroplasts B. mitochondria C. cytoplasm D. Golgi apparatus
Which hormone results in the production of more neurons in the higher vocal center of the brains of male, but not
female, zebra finches?
a. testosterone b. estrogen c. octopamine d. epinephrine e. androgen
Which conclusion do these data support?
1.Wild type mice are slower swimmers.
2.Both wild type mice and mice with the R451C mutation are able to learn.
3.Wild type mice are quicker learners.
4.Genetic modification improves swimming ability in mice.
Pathogens that enter through the gastrointestinal tract are adapted to survive ____ and ____
Fill in the blank(s) with the appropriate word(s).