Un-oxygenated blood enters the right atrium from the top of the heart.
A. inferior vena cava
B. superior vena cava
C. aorta
Select your answer:
Topics:
Heredity Pharmacology Parathyroid Gland Basics of Cardiology Autoimmune Disease Immunity in Humans -ology Immunology and Serology Pathology - Chronic Inflammation Human Eye and Colourful World Bacteria, Viruses, Protozoa Fungi EKG CCMA Cell Theory Heart Vocab and Blood Flow Pathway Hearing ImpairmentOther quiz:
Microbiology › ViewIn order for B cells to produce antibodies and cytotoxic T cells to attack infected host cells, they must first
A. undergo maturation, encounter their specific antigen target, and then become activated through cytokines.
B. be activated by interleukins, encounter an antigen, and then develop specificity toward it.
C. encounter an antigen, develop specificity for that antigen, and then remember the antigen
D. recognize self markers, develop specificity for the markers, and then produce clones
The Chemistry of Microbiology › View
The atomic mass of an atom is ________.
A. the sum of the masses of its photons and electrons
B. the number of protons
C. the sum of the masses of its protons, neutrons, and electrons
D. the number of electrons