Which is the correct sequence in the passage of oxygen?
a. left atrium, left ventricle, pulmonary artery, lungs
b. right atrium, pulmonary artery, right ventricle, lungs
c. pulmonary artery, right atrium, right ventricle, lungs
d. right atrium, pulmonary artery, right ventricle, lungs
e. right atrium, right ventricle, pulmonary artery, lungs
e. right atrium, right ventricle, pulmonary artery, lungs
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In the cellular immune response,
A) T cells attack healthy body cells. B) T cells attach directly to antigens and destroy them. C) T cells produce antibodies directly against antigens. D) B cells produce antibodies directly against antigens.
In a normal electrocardiogram, the
A. P wave occurs after the QRS complex but before the T wave. B. QRS complex results from ventricular depolarization. C. P wave results from repolarization of the atria. D. repolarization of the atria is clearly visible. E. T wave represents depolarization of the atria.
Name the muscle that flexes and extends the toes.
A. Flexor digitorum brevis B. Lumbrical C. Plantar interossei D. Extensor digitorum brevis
The pericardium is a two-layered serous membrane that
A. encloses the heart. B. encloses the kidney. C. covers the small intestine. D. provides lubrication for the knee. E. encloses a lung.