Question

question 17
vessels that carry blood toward the heart are called

question 18
which of the following statements regarding carbon dioxide is false:
it plays an important role in the bodys defense against changes in acidity.
it is a by - product of energy metabolism.
it binds with hemoglobin to form a compound called carbaminohemoglobin.
it moves from tissue into blood via active transport by special protein channels.

question 19
the primary role of the cardiovascular system is:
pumping the heart
ventilating the lungs
supplying tissues with oxygen and nutrients
removing metabolic by - products
both c and d

Explanation:

• Question 17: Veins are the blood - vessels that carry blood towards the heart.
• Question 18: Carbon dioxide moves from tissue into blood via simple diffusion, not active transport by special protein channels. So the statement "It moves from tissue into blood via active transport by special protein channels" is false.
• Question 19: The primary role of the cardiovascular system is to supply tissues with oxygen and nutrients and remove metabolic by - products.

Answer:

• Question 17: Veins
• Question 18: It moves from tissue into blood via active transport by special protein channels.
• Question 19: Both C and D (supplying tissues with oxygen and nutrients; removing metabolic by - products)