How does the nephron and associated hormones respond to an excess of K+ in the blood?
What will be an ideal response?
Answer: A rise in K+ in the blood stimulates the Na+/K+ ATPase of the cortical collecting duct, bringing more K+ into these cells, which then leaves to the lumen via a K+ channel, causing more K+ to be lost in the urine. Also, higher blood potassium triggers higher aldosterone levels, which simultaneously cause Na+ reabsorption and potassium secretion.
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The cerebrum consists only of gray matter.
Answer the following statement true (T) or false (F)
This figure shows the muscles of facial expression. What muscle does number 9 indicate?
A. Sternocleidomastoid B. Levator labii superioris C. Mentalis D. Risorius E. Depressor labii inferioris
Muscles that act on the __________ cause movement at the hip, knee, and foot joints.
A. upper limb B. trunk C. lower limb
Which substance does NOT inhibit platelet aggregation?
A. Prostacyclin B. von Willebrand factor C. CD39 D. Nitric oxide