Urine formation
Aquaporin channels are only found in the collecting duct. And why :)
True or false
False
Aquaporin channels are not only found in the collecting duct; they are found throughout the nephron (e.g., AQP1 in the proximal tubule/descending limb) and in many other tissues. However, collecting duct aquaporins (mainly AQP2) are unique because they are regulated by ADH to control final urine concentration.
The end result of the RAAS is to ________.
increase blood pressure
Gas moves from an area of ________ partial pressure to an area of ________ partial pressure.
high; low
Gas flow decreases as ________ increases.
resistance
Exercise can trigger symptoms of AMS due to which of the following? and why
low partial pressure of oxygen
low atmospheric pressure
abnormal neural signals
small venous reserve of oxygen
small venous reserve of oxygen
Exercise at high altitudes triggers symptoms of Acute Mountain Sickness (AMS) because it exacerbates the existing state of low oxygen availability. Under normal conditions, the body maintains a venous reserve of oxygen—a supply of oxygen bound to hemoglobin in the venous blood that can be utilized when tissue demand increases.
Only substances that are filtered by the kidneys can be excreted by them.
True or false
why
False
While glomerular filtration is a primary mechanism, the kidneys also excrete substances through tubular secretion, where waste products are transported directly from the blood into the renal tubules without being filtered first.
Renin is released in response to ________.
decreased blood pressure
What is the normal resting respiratory rate for an adult?
breaths per minute
12-16 breaths per minute
Which structures would be the final lymphatic structure encountered when draining interstitial fluid from the left thigh?
Left lymphatic duct
You (a healthy individual) are swimming underwater when you can no longer resist the urge to breathe.
This overwhelming urge is probably due to which physiological process? AND WHY
the increase in pH has made your blood dangerously alkaline.
the autorhymthic cells in your diaphragm contracting.
the decrease in O2 available to the cells of the body
the increase in plasma H +
the increase in plasma H +
The overwhelming urge to breathe while underwater is primarily triggered by the accumulation of carbon dioxide (CO2) in the blood.
What effect do you expect ANP to have on glomerular filtration?
Increase glomerular filtration rate
Which hormone is derived from liver secretions and cause vasoconstriction of renal blood vessels?
Angiotensin II
Which of the following prevents the alveoli from collapsing?
residual volume
Which muscles are contracted during the expiration phase of forced breathing?
Internal intercostals
During a physical examination, Joe learns that his resting tidal volume is 550 mL; his average resting respiratory rate is 15 breaths per minute; his total lung capacity is 6,000 mL; and his anatomic dead space is 150 mL. Joe's resting alveolar ventilation is
6.0 L/min.
Which of the following structures of the nephron contributes most to the establishment of the medullary gradient?
Ascending limb of the nephron loop
What is the rate-limiting (regulated) step for stimulating the secretion of aldosterone?
Conversion of angiotensinogen to angiotensin I in the blood
What type of receptor is primarily resonsible for providing feedback to set respiratory rate?
Chemoreceptor
Which are referred as primary lymphoid organs due to their structural and functional importance in immune system function?
Red bone marrow and Thymus
What can we infer about hemoglobin from a right-shifted oxygen dissociation curve?
Hemoglobin has a lower affinity for oxygen and unloads oxygen more readily
What is the function of the vasa recta?
To preserve the medullary gradient by removing the interstitial fluid produced due to the countercurrent multiplier of the nephron loop.
After prolonged exertion in a hot climate, baroreceptors would __________ firing, leading to __________ secretion of __________ and thus __________ renal reabsorption of __________.
decrease;increased; vasopressin; increased; water
What is the primary function of external respiration in the respiratory system?
Exchange of oxygen and carbon dioxide between the lungs and blood
Drug X is a new drug to treat Alzheimer's Disease. This drug is able to cross the blood-brain barrier and circulate in the Cerebrospinal fluid (CSF). The drug is slightly acidic and at the recommended dose it decreases the CSF pH from 7.4 to 7.3.
Will Drug X have any effect on respiration?
It will cause an increase in respiratory rate.
A decrease in CSF pH (increased acidity) stimulates central chemoreceptors in the brainstem. This activation increases respiratory rate in order to blow off more CO₂ and help compensate for the acidification.
You are the CEO of a drug company where you've asked five teams of scientists to generate new drugs to decrease blood pressure. You can only send four of the drugs to market. Which of these drugs is least likely to decrease blood pressure and can be eliminated from potential development? and why
A drug that decreases liver production of angiotensinogen
A drug that enhances the activity of angiotensin-converting enzyme
A drug that decreases sympathetic stimulation of renal arterioles
A drug that is an agonist of atrial natriuretic factor
A drug that interferes with aldosterone synthesis
A drug that enhances the activity of angiotensin-converting enzyme