Answer:
The answer is B. descending loop of henle.
Explanation:
Most of the filtrate water is reabsorbed at the level of the DESCENDING LOOP OF HENLE. This branch has a wide cortical zone and an extreme spinal cord; It has low permeability to ions and urea, but is very permeable to water; there are a few channels of aquapurine type 1 that absorb 20% of the filtered water.
Answer:
Oxygen passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.
Explanation:
Answer:
The correct answer will be option C- endothelial cells of the endocardium.
Explanation:
The pulmonary capillary bed is the network of capillaries in the lungs- alveolar region mainly where gaseous exchange takes place.
This bed receives blood from the pulmonary arteriole which arises from the pulmonary artery. The blood is pumped to this artery through the right ventricle of the heart. The right ventricle- especially the valves is lined from with the endocardium which lines it and prevents the blood from sticking to the inside of the chamber.
Therefore, the blood pumped from the right ventricle is in contact with the endothelial cells of the endocardium and option C is the correct answer.
Answer:
The onset, and treatment of PTSD is no easy matter. In order for such a disorder to appear, which is later expressed with tremendous peaks of stress, crisis, behavioral problems, panic disorders, anxiety disorders, and many more debilitating conditions, a person must have experienced an event, or circumstance, that traumatically negatively impacted the correct psychological and emotional processes of the mind. In these patients, one the most common situations is that panic attacks and anxiety peaks happen particularly when the traumatic event, moment, or circumstance is remembered, and they are very good at remembering not just the moment itself, but all elements that surrounded that trauma. Also, they are able to make really clear connections and associations between those events and normal events in life that, when they appear, trigger the defensive responses of the mind.
The idea of administering a patient with PTSD with medication that would stop memory formation shortly after a traumatic event would not be a good idea simply because while the drugs focus on the chemical processes involved in memory formation, this procedure ignores that memory is much more than just chemicals in the brain. This has been show time and time again in research. Even with strong medication that basically generates amnesia, or trauma to the brain that may cause amnesia, it has been seen, and science cannot yet fully explain how, these patients may have partial, or total recovery of memories. And because the process of memory formation is still so misunderstood, and not all the factors involved are completely known, simply administering a drug that would stop the hormones that are believed to play a role in memory formation could become more of a problem for the patient. Also it is not being considered that amnesia causes even more stress in patients, as somehow the brain still recognizes that there is information present, but cannot simply bring it to concious awareness.
Answer:
The best answer from the choices, to the question: The cause of the hyperventilation is described by which of the following statement:___, would be, B: A decrease in the bicarbonate concentration stimulates ventilation.
Explanation:
The acid-base balance in the human body, is a very restrictive one. Normal ranges in this base are: 7.35 to 7.45. Whenever the values go either below 7.35 or above 7.45, we are talking about a person going into acidosis or alkalosis. Both situations are pretty serious and they have to do with the balance between the amounts of bicarbonate, and CO2 in the form of carbonic acid, in the blood. The normal ratio of bicarbonate to carbonic acid, is usually 20:1. Chemoreceptors, especially central ones in the neck, measure constantly that the balance is kept and if this is not the case, then several mechanisms will be put into place to recover it. One such measure is respiratory, and the other is metabolic. In the case of this 17-year-old, he has a pneumonia, which means that from the start, one of his recovery mechanisms is impeded, which is the respiratory mechanism of balance. He is also having metabolic problems with his system of compensation because his body is already producing high levels of H+ ions and not enough bicarbonate. Hyperventilation in this person is attempting to expel as much CO2 as possible, to try and restore the balance. The first thing that is sensed by the receptors is the changing in the 20:1 ratio, the increase in pH due to too much carbonic acid, and thus the body initiates the use of CO2 expulsion by the lungs, while metabolic mechanisms come into play.
