Carla was startled by an extremely loud bang that sounded like a gunshot. Her heartbeat accelerated rapidly. When she found that the noise was only a car backfiring, she felt greatly relieved but her heart kept beating heavily for over half an hour. Why did this happen?
What will be an ideal response?
The effects of sympathetic activators are long lasting, because norepinephrine is inactivated slowly. Also, the adrenal medulla releases this neurotransmitter, which adds to the long-lasting effects of adrenergic stimulation.
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The superior, middle, and inferior conchae extend medially from the lateral masses of the ethmoid bone.
Answer the following statement true (T) or false (F)
In response to hemorrhage, there is
A) peripheral vasodilation. B) increased parasympathetic stimulation of the heart. C) mobilization of the venous reserve. D) constriction of elastic arteries to maintain blood pressure. E) increased blood flow to the digestive system.
How do the varieties of pain sensations differ from one another?
What will be an ideal response?
Cleavage occurs during
A. the pre-embryonic period. B. the embryonic period. C. fertilization. D. the fetal period. E. organogenesis.