The use of chemotherapy for brain tumors is complicated by the fact that
a. brain tumors do not respond to traditional chemotherapy.
b. chemotherapy causes too much damage to neurons to be considered as a treatment for brain tumors.
c. many substances used in traditional chemotherapy do not cross the blood-brain barrier.
d. substances used in traditional chemotherapy mimic the actions of naturally occurring neurotransmitters.
Question 2
Your physician somberly informs you that you have been diagnosed with a Grade I tumor and will require surgery. What does this mean?
a. You may want to pass up the surgery and concentrate on enjoying your remaining time, as Grade I tumors are typically rapidly fatal with or without treatment.
b. You should ask for a second opinion, as Grade I tumors are benign, and do not need to be removed through surgery.
c. You can feel mildly optimistic, as Grade I tumors tend to recur after surgery, but they also grow slowly.
d. Your chances of survival are relatively good, as Grade I tumors are usually benign, slow-growing, and respond well to surgery.
Development of the human brain.
The nervous system is described as having two interconnected divisions: the central nervous system (
Although average brain size increases gradually though time in H. erectus, individuals with small br
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