Sensory receptors are specialized cells or multicellular structures that collect information
from the environment and stimulate neurons to send impulses along sensory fibers to the
brain, where the cerebral cortex forms a perception.
Indicate whether the statement is true or false
TRUE
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Two of the four globin chains in the hemoglobin molecule are called alpha chains and the other two are called ________________ chains
Fill in the blank with correct word.
When is a conceptus considered to be an embryo?
A. When the trophoblast and embryoblast have differentiated from each other B. As soon as the first traces of all the organ systems are present C. When the three primary germ layers have formed D. When the egg is fertilized by the sperm E. After the conceptus has implanted in the uterine wall
Sympathetic stimulation causes saliva to be more viscous
Indicate whether this statement is true or false.
Which of the following statements regarding the sliding filament model is false?
A. The A band remains constant in length. B. Actin and myosin do not shorten during contraction. C. The sarcomere shortens. D. Both actin and myosin myofilaments shorten during contraction. E. The I band and H zones become narrower during contraction.