The two electrolytes most important in enabling nerves to respond to stimuli are? A. Chloride and sodium B. Phosphorous and calcium C. iron and calcium D. Potassium and sodium

How does the semi-permeable nature of the cell membrane maintain homeostasis ?  A. By providing two-way traffic for nutrients and waste needed to maintain metabolism. B. By creating a barrier which allows excitable cells to propagate action potentials . C. By preventing steroid hormones from entering the cell easily. D. A and B

Use the illustration below to answer questions 7 and 8. 7. Which number represents a dendrite? a) 1 b) 2 c)3 d)4 e) 5 8. What number represents the myelin sheath? a) 1 b)2 c)3 d)4 e) 5

Which statement about muscles is NOT right? A. tendons connect muscle organs to bones B. One motor neuron can activate many different muscle fibers C. Smooth muscles receive messages from neurons via little swollen areas that release neurotransmitters D. Skeletal muscles are triggered to contract when motor neurons release adrenalin neurotransmitters in the synapse

For the brain to use its main source of fuel, what does it also need? A. Steroid hormones B. Vitamin C C. Thiamine D. Acetylsalicylic acid

Which can withstand greater tensile stress? a. bone b. cartilage c. ligament d. adipose tissue

Which describes the chemical synapse between two neurons? A. The spaces between the neurons are filled with a chemical substance that facilitates exchange of signal. B. Movement of ATP between neurons is the most immediate source of energy for the resting membrane potential. C. Electrical signal becomes passively conducted across the neuroneal membrane to transport the signal at long distances.

What is the primary purpose of a bronchoscope? a. To view the inside of the bladder b. To view the inside of the lungs c. To view the inside of the stomach d. To view the inside of the heart     Only answer needed

Angiotensin is a hormone that stimulates vasoconstriction and increases blood pressure. Which effect would also be expected from angiotensin function?   A. increased secretion of sodium in the kidney   B. decreased secretion of sodium in the kidneys   C. increased reabsorption of sodium in the kidneys   D. decreased reabsorption of sodium in the kidneys

What is a way to record the signal from a single neuron?     a. Two recording electrodes can measure the difference in charge.     b. An fMRI scan can single out a single neuron.     c. An EEG will record individual neurons.     d. A recording electrode and a reference electrode can measure the difference in charge.