What happens when the neuron's membrane potential reaches threshold voltage? ANSWER Voltage-gated potassium channels are opened. Leak channels are activated. Sodium channels are inactivated. Voltage-gated sodium channels are opened. IDON'T KNOWYET

The __ division of the PNS sends motor information to muscles and glands. parallel efferent afferent sensory serial

True or false: A larger cell will be expected to be more metabolically active because, relative to its volume, its surface area is smaller. True False

Which structures does Giemsa stain? a) Phosphate groups in the DNA b) The cell membrane c) Extracellular matrix d) Endosomes

Which of the following is NOT caused by a protozoan? Multiple Choice Athlete's foot Malaria Toxoplasmosis Cryptosporidiosis All are caused by protozoans

Why is DNA antiparallel? It has a ladder shape. It has double strands complementing each other. The bases in one strand pair with the other bases in the complementary strand. Its double strands run in opposite directions.

The esophagus joins the stomach through an opening called the: pyloric orifice cardiac orifice cardiac sphincter pyloric sphincter

Evolution Evidence 5/10 Give an example of a structure that is present in both human and fish embryos, but develops into different structures in each by birth. Enter the answer

Where does filtration of the blood occur within the kidneys? Renal pelvis Renal pyramids Renal medulla Renal cortex

Multiple Choice Question During vasoconstriction, smooth muscle in an artery contracts. The smooth muscle of an artery is located in the __ tunica externa tunica media tunica interna

What happens when a muscle contracts and its fibers shorten? ANSWER The origin and the insertion move in opposite directions. The insertion moves toward the origin. The origin and the insertion move in the same direction. The origin moves toward the insertion. IDON'T KNOWYET