In an ECG, the P wave indicates that the atria
A. are misfiring in arrhythmia.
B. are about to enter atrial diastole.
C. are about to enter atrial systole.
D. have fully repolarized.
Answer: C
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Match the type of reflex to its description.
1. integrated in the brain 2. several neurons involved in a pathway; can be complex 3. involves skeletal muscles 4. reflexes that one is born with; genetically determined 5. integrated in the spinal cord, often modulated by the brain 6. an example would be slowing or speeding the heart and other internal organs that are not consciously controlled 7. our experiences tell us how to behave; bracing yourself in anticipation would be an example
What three functional roles in a movement are used to characterize muscle groups? Give a brief description of each action
What will be an ideal response?
The sebaceous glands of the skin secrete sebum, which:
A. keeps the skin soft and prevents cracking. B. kills microorganisms on the skin surface. C. allows the body to cool itself through sweating. D. contracts the muscles that pull hair into an erect position.
During implantation, the trophoblast divides into a deep layer called the ________, which is composed of individual cells.
A. cytotrophoblast B. amnion C. embryoblast D. syncytiotrophoblast E. chorion