Which of the following statements correctly describe(s) the driving forces for diffusion of na+ and k+ ions through their respective channels? select all that apply. a. the diffusion of na+ ions into the cell is facilitated by the na+ concentration gradient across the plasma membrane. b. the diffusion of na+ ions into the cell is impeded by the electrical gradient across the plasma membrane. c. the diffusion of k+ ions out of the cell is impeded by the k+ concentration gradient across the plasma membrane. d. the diffusion of k+ ions out of the cell is impeded by the electrical gradient across the plasma membrane. e. the electrochemical gradient is larger for na+ than for k+.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

thinking it would be d not too sure but i think it's right

label a cell membrane

label b cytoplasm

label c ribosomes

label d dna

the membrane forms the outside of the cell

cytoplasm is the liquid within

ribosomes are the components within that distribute rna

the dna is the genetic make-up

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.