Iodine accumulation in thyroid cells involves symport with
A) sodium.
B) potassium.
C) chloride.
D) hydrogen.
A) sodium.
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Blood is pumped through the entire body in ________________________________________ circulation
Fill in the blank(s) with correct word
What are the most powerful stimuli for breathing?
A) high pH; high CO2 B) low pH; low CO2 C) low pH; high CO2 D) high ph: low CO2
Answer the following questions true (T) or false (F)
1. Neuroendocrine glands, such as the adrenal medulla, consist of nervous tissue yet secrete chemicals known as neurohormones. 2. In the second-messenger system, the first messenger initiates a cellular change in activity by binding a receptor in the plasma membrane. 3. Endocrine cells that release hormones in response to the concentration of a certain ion or molecule in the blood or extracellular fluids are stimulated by humoral stimuli.
The most significant complication of infant prematurity is infant respiratory distress syndrome, which occurs because very young premature infants cannot produce ______________
A. surfactant B. blood C. oxygen D. erythropoietin E. growth hormone