2a. Attaches brain to spinal cord
b. Contains centers for auditory and visual reflexes
C. Cranial nerves V (trigeminal), VI (abducens),
VII (facial), and VIII (vestibulocochlear) arise here
d. Contains cardiac center (which regulates heart
rate) as well as vasomotor center (which controls
blood vessel diameter)
Contains two respiratory centers, which regulate
breathing
f. Contains clusters of neurons integral to muscle
control
g. Contains tracts that convey signals to and from
different parts of the brain

b. read the phase at the intersection of any given temperature and pressure.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.