★ Immunity Quiz
If the skin is broken then a blood clot forms to seal this cut.
What is the first step in the process of blood clotting?
A. Fibrinogen turns into fibrin
B. Platelets release clotting factors
C. Fibrinogen is converted into thrombin
D. Thrombin is converted into prothrombin
Select your answer:

Topics:
Physical and Sensory Impairment Cell Reproduction Genes and DNA Fainting and Nosebleed Cell Review Disease Cards My Teeth Cell Structure and Function Concept Brain/Neuron Anatomy Skeletal System Homeostatic Imbalances Biology Assessment Virus and Bacteria Organ Systems Cardiovascular Diseases NeuronsOther quiz:
Physical › ViewWhich one is false ?
A. We can avoid chronic disease
B. Chronic disease can transfer to other person
C. We can prevent from chronic disease
DNA & Types of Reproduction › View
Strands of DNA are tightly coiled in
A. DNA
B. Base Pairs
C. Chromosomes
D. Mitochondria