Clotting begins when a occurs in a blood vessel wall. Almost immediately, cling to the blood vessel wall and release , which helps to decrease blood loss by constricting the vessel. is also released by damaged cells in the area. This chemical substance causes to be converted to . Once present, thrombin acts as an enzyme to atatch molecules together to form long, threadlike strands of , which then traps flowing by in the blood.

Options

1. FIBRINOGEN
2. SEROTONIN
3. PROTHROMBIN
4. BREAK
5. FIBRIN
6. THROMBOPLASTIN
7. ERYTHROCYTES
8. PLATELETS
9. THROMBIN

The image shows embryos of three vertebrate classes

Where does all the water go? according to the environmental protection agency (epa), in a typical wetland environment, 39% of the water is outflow; 46% is seepage; 7% evaporates; and 8% remains as water volume in the ecosystem (reference: united states environmental protection agency case studies report 832-r-93-005). chloride compounds as residuals from residential areas are a problem for wetlands. suppose that in a particular wetland environment the following concentrations (mg/l) of chloride compounds were found: outflow, 60.4; seepage, 73.7; remaining due to evaporation, 26.4; in the water volume, 46.8. (a) compute the weighted average of chlorine compound concentration (mg/l) for this ecological system. (round your answer to one decimal place.) mg/l (b) suppose the epa has established an average chlorine compound concentration target of no more than 58 mg/l. does this wetlands system meet the target standard for chlorine compound concentration? yes. the average chlorine compound concentration (mg/l) is too high. yes. the average chlorine compound concentration (mg/l) is lower than the target. no. the average chlorine compound concentration (mg/l) is lower than the target. no. the average chlorine compound concentration (mg/l) is too high.

What process creates gametes? a.fertilization b.mitosis c.meiosis