Valves in veins
A. support them
B. protect them
C. prevent the backward movement inside them
D. provide them elesticity
Select your answer:
Topics:
Physio Intro Practice Muscles Genetics Vocabulary How the Eyes work Animal Nutrition -ology Introduction to Pharmacology Parts of the Skin T Cells Human Eye and Colourful World Cell Structure and Functions Fluid and Electrolytes Histology of Nervous and Muscle Tissues Effect of Exercise on Cardio Respiratory System & Muscular Forensics TermsOther quiz:
Histology › ViewA histological sample shows poorly preserved cellular structures. Upon reviewing the preparation steps, you find that fixation was done with ethanol instead of formalin. Which of the following is the most likely issue?
A. Lipid structures were dissolved.
B. Proteins were inadequately cross-linked.
C. The sample was not properly dehydrated.
D. Sectioning was performed too quickly.
Macromolecules and Enzymes › View
The graph shows the effect of pH on an enzymes action. What conclusions can be drawn from the choices below that would affect the enzymes rate of reaction?
A. Removing the enzyme when the pH is at 11
B. Lowering the pH of the enzyme from 9 to 7
C. Putting the enzyme in lemon juice, which is at 4 pH.