Which of the following is not a way neuroglia cells help neurons? A. Provide support and protection B. Speed up electrical signals C. Provide nutrients D. Send electrical signals themselves

The walls of blood vessels in the brain are formed by cells that are very tightly packed. This arrangement of cells provides which of the following properties of most brain vasculature?     a. efficient removal of waste products by blood systems     b. rigidity and likelihood of stroke     c. most large and charged molecules cannot move from the blood to the brain     d. easy access to required blood chemicals such as glucose, oxygen, and various hormones   What does it mean to say that acetylcholine exerts ionotropic effects?     a. It opens ion channels.     b. It increases the concentration of ions within the vesicles.     c. It alters the permeability of the presynaptic neuron.     d. It changes the electrical charge of sodium ions from positive to negative.

which of the following cell types contain ATP- dependent K+ channels and voltage-gated Ca++ channels a. alpha cells of the pancreas  b. fat cells c. liver cells d. beta cells of the pancreas e. muscle cells

Where can you find neuropeptides, such as endorphin? A. On their ionotropic receptors. B. Inside small clear synaptic vesicle. C. In dendritic spine. D. In mitochondria. E. Inside large dense core vesicles. 主