Which function of proteins is NOT correctly matched with the example?
A. Contraction - actin and myosin in muscles
B. Structure - collagen and keratin
C. Protection - packing around organs and glands
D. Regulation - enzymes and hormones
E. Transport - hemoglobin
Answer: C
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Damage to the heart can cause inadequate blood circulation, which can lead to more damage to the heart. This is an example of a positive feedback cycle
Indicate whether this statement is true or false.
Match the structure with the appropriate description.A. Formed when the right and left vertebral arteries uniteB. Supplies blood to the face, nose, and mouthC. Terminates by forming the middle cerebral arteriesD. Supplies blood to the arm and shoulder regionsE. Sense organs that monitor blood pressureCarotid sinuses
Fill in the blank(s) with the appropriate word(s).
When calcium levels in the blood are low, the ________ produce _______ which stimulates the breakdown of bone, releasing calcium.
A. parathyroid glands; parathyroid hormone B. parathyroid glands; calcitonin C. adrenal glands; calcitonin D. adrenal glands; aldosterone
Which answer is true about NET water movement between two solutions that are separated by a semipermeable membrane
a. It will always be toward the solution with the lower osmotic pressure. b. It might be toward the solution with the lower osmotic pressure. c. It will always be toward the solution with the lower hydrostatic pressure. d. It might be toward both solutions at the same time. e. None of the above statements are true.