Given that oxygen is consumed and carbon dioxide produced during exercise, and we know that the ventilatory system responds to these variables, why do exercise scientists believe that the increase in ventilation during exercise is NOT due to these chemoreceptor responses?
What will be an ideal response?
Answer: Although PO2 drops and PCO2 rises in the venous system during exercise, arterial levels remain relatively constant due to the matching of ventilation to metabolic rate. There is evidence that direct neuronal stimulation from brain regions controlling locomotion stimulate ventilation, and also that neuronal feedback from sensory receptors in the muscles stimulate ventilation. These are thought to be the most important drivers of ventilation during exercise. However, the rise in H+ and or K+ during heavy exercise will stimulate ventilation, as does a rise in blood epinephrine levels.
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The process of bones increasing in width is known as ________.
A) closing of the epiphyseal plate B) long bones reaching adult length and width C) appositional growth D) concentric growth
What cells line the ventricles of the brain?
A) ependymal cells B) neurons C) epithelial cells D) astrocytes
The shell and shell pigments of an egg are produced in the ____________
Fill in the blank(s) with correct word
Cells of the central nervous system that are in direct contact with cerebrospinal fluid are:
a. astrocytes b. ependymal c. oligodendrocytes d. microglia cells