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 into the bloodstream, 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)
Protein production is a function of the
A) microtubules. B) mitochondria. C) rough ER. D) ribosomes. E) Golgi apparatus.
The portions of an antigen's exposed surfaces to which its specific antibody binds are regions called
A) opsonins. B) the constant segments of the light and heavy chains. C) antigenic-determinant sites. D) complement-binding sites. E) antigen-binding sites.
Immunological competence develops ________.
A. at birth B. during gestation C. at the onset of puberty D. shortly after birth