The QRS complex in an electrocardiogram best represents:
A. depolarization of the atria
B. repolarization of the atria
C. depolarization of the ventricles
D. repolarization of the ventricles
E. the delay at the AV node
C
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Which of the following vitamins is needed for proper night vision and helps to resist infections?
A) Vitamin A B) Vitamin B C) Vitamin C D) Vitamin D
The face, head, and cheeks are located in a dermatome supplied by nerves from what spinal cord region?
A) sacral B) thoracic C) cervical D) lumbar E) No spinal nerves innervate the dermatome containing the face.
In the parasympathetic division, ________ ganglia are located in the wall of the target organ.
Fill in the blank(s) with the appropriate word(s).
The coronary sinus is a modified vein that collects venous blood from all areas of the heart and drains it directly into the left atrium of the heart.
Indicate whether the statement is true or false.