The extracellular matrix performs a variety of functions, including mediation of interactions between cells. __________ is a glycosaminoglycan (GAG), which provides protection and acts as a shock absorber
A) Collagen
B) Chondroitin sulfate
C) Hyaluronan
D) Fibronectin
Fill in the blank with the correct word.
Answer: C
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Baroreceptors have stretch-sensitive ion channels in their cell membrane. Increased pressure on the membrane opens the channels and allows ion flow that initiates action potentials. What kind of ion probably flows through these channels and in which direction?
What will be an ideal response?
Heme released from hemoglobin in aged red blood cells is decomposed in the liver into
A) iron and the bile pigment biliverdin, which is eventually converted to bilirubin. B) serum and plasma proteins. C) iron and interleukins. D) iron and the bile pigment bilirubin, which is eventually converted to biliverdin.
The "first line" of cellular defense against pathogenic invasion is __________.
a. interferons b. the complement system c. phagocytes d. pathogens
A pulmonary embolism is most likely to enter the pulmonary circulation directly from which part of the heart?
A) left atrium B) right ventricle C) left ventricle D) right atrium