Mohammed has a kidney condition that raises the level of potassium ions in the extracellular fluid that bathes cells. What effect would you expect this condition to have on his ability to generate nerve impulses (action potentials)?

Hemolytic disease of the newborn will never happen to the child of an Rh-negative mother if a. the child is type O-positive. b. the child is Rh-positive. c. the father is Rh-positive. d. the father is Rh-negative.

Which of the following is an example of a population? a. all individuals of the same species in an area b. all the species that can interact in an ecosystem c. a community and its interaction with the physical environment d. the part of Earth that supports life

Indicate the correct statement: a. An antibody is specific to one particular antigen. b. Antibodies are held within the cell that produces them. c. Antibodies are produced by macrophages. d. Antibodies can be effective against viruses that are inside the host cell.

1.       The ______ is an insulating layer formed by Schwann cells that increases the rate of an action potential. 2.       The ______ uses cellular energy to move sodium ions out of the axon and potassium ions into the axon.

You are nearly deafened by the first heart sound, which is caused by a. the opening of the atrioventricular valves. b. the closing of the atrioventricular valves. c. the opening of the semilunar valves. d. the closing of the semilunar valves.

Dental x-ray films are taken using small doses of radiation and are used to detect tooth decay, injuries to the roots of teeth, and problems with the bones supporting the teeth. A dental professional covers the patient with a lead apron that runs from the neck to the abdomen and then leaves the room to take the x-ray film. Why are such precautions necessary?

The autonomic nervous system a. cannot be affected by emotional states. b. controls conscious body movements. c. is entirely contained within the central nervous system. d. automatically adjusts the functioning of internal organs to suit conditions

Myoglobin is a. the major component of the thick filament. b. an oxygen-binding molecule in muscle cells. c. released at the neuromuscular junction. d. the molecule that locks the actin-binding site.

1.       Bone is hardened by the minerals ______________ and ______________. 2.       The cells that form bone are called ______________. 3.       A ______________ is the overstretching or tear in a ligament that may cause pain after the injury.