The answer is the moon because it’s closer than any other celestial body.
It is useful to doctors because functional brain imaging helps doctors prepare for brain surgery in patients who have a diagnosis of a brain tumor or a seizure disorder.
If no pregnancy occurs, the corpus luteum is reabsorbed into the ovary after two weeks and the hormone levels drop; this causes menstruation.
From the right atrium, the deoxygenated blood drains into the right ventricle through the right atrioventricular (AV) valve, which is so named because it is between the atrium and the ventricle. This valve is also referred to as the tricuspid valve because it has three flaps in its structure. When the ventricles contract, the AV valve closes off the opening between the ventricle and the atrium so that blood does not flow back up into the atrium.As the right ventricle contracts, it forces the deoxygenated blood through the pulmonary semilunar valve and into the pulmonary artery. Semilunar means half-moon and refers to the shape of the valve. Note that this is the only artery in the body that contains deoxygenated blood; all other arteries contain oxygenated blood. The semilunar valve keeps blood from flowing back into the right ventricle once it is in the pulmonary artery.The pulmonary artery carries the blood that is very low in oxygen to the lungs, where it becomes oxygenated. i hope this helps you
Answer:
Stimulus, sensor, and response.
