Which of the following is used to describe the amount of blood ejected from the left ventricle during each contraction?

A. The medulla oblongata, located in the brainstem, is directly responsible for controlling the rate and depth of breathing. It detects changes in blood levels of CO2 and adjusts respiratory activity accordingly.

B. The hypothalamus regulates various autonomic functions, including body temperature, hunger, and thirst, but it is not directly involved in the control of respiration.

C. The midbrain is involved in functions such as vision, hearing, and motor control, but it does not directly control respiration.

D. The cerebellum is responsible for coordinating movement and balance, but it does not regulate respiratory control.

A. After passing through the proximal convoluted tubule, the filtrate enters the Loop of Henle, where further reabsorption of water and solutes occurs. This is the next step in the nephron's sequence.

B. The collecting duct comes much later in the nephron pathway, receiving filtrate after the distal convoluted tubule. It is not the immediate successor to the proximal convoluted tubule.

C. The glomerulus is the site where blood filtration begins, preceding the proximal convoluted tubule, so the filtrate does not return here.

D. Bowman's capsule collects the initial filtrate from the glomerulus before it enters the proximal convoluted tubule, making it an earlier step in the nephron process.