What feature characterizes simple columnar epithelium of the digestive tract?
A) dense microvilli
B) a rich vascular supply
C) fibroblasts
D) cilia
A) dense microvilli
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What is the fibrous covering on the surface of bone that is involved in thickening of the bone called?
a) periosteum b) endosteum c) marrow d) epiphysis e) metaphysis
Carrier molecules are located within the
A) cytoplasm. B) plasma membrane. C) transport vesicles. D) lipid droplets. E) chromosomes.
The perineurium defines the boundary of a ________.
Fill in the blank(s) with the appropriate word(s).
Curare is a poisonous plant extract. Curare molecules have a chemical structure like the neurotransmitter ACh. Curare can bind to the ACh receptor site on the chemically gated ion channels in the motor end plate
Even though curare will bind to the receptor site it will not open the ion channel and no ions will pass through. What do you think the symptoms of curare poisoning would look like? A) Curare will only affect muscles with ACh receptors, paralyzing them. B) Smooth muscles will become stimulated causing quick movement of nutrients through the digestive system. C) Curare will only affect cardiac muscle, causing fibrillations of the heart. D) Muscles will respond too quickly and cause a severe tremor.