REVIEW & REHEARSE 21 CIRCULATION and RESPIRATION

!ques1! Check Your Knowledge

Question 21.14

1. Which of the following is the fluid found in an insect’s open circulatory system?

  • a) blood
  • b) hemoglobin
  • c) lymph
  • d) hemolymph
  • e) tracheal lymph

Question 21.15

2. How can flatworms, simple animals with a flat body shape, survive without a circulatory system?

  • a) Flatworms do not have internal body fluids that need to be sectioned off and transported by vessels.
  • b) Because all cells in flat-bodied animals are in direct contact with the external environment, direct diffusion is sufficient for all their respiratory needs.
  • c) In flatworms, all cells are located near central body branches or near the body surface, so diffusion alone can transport important nutrients.
  • d) Flatworms use the water currents in their aquatic environment to circulate the necessary nutrients throughout their body.
  • e) Flatworms have multiple hearts and so can pump blood directly into tissues without needing a circulatory system.

Question 21.16

3. Fishes have:

  • a) a two-chambered heart.
  • b) multiple hearts.
  • c) an open circulatory system.
  • d) a four-chambered heart.
  • e) Both a) and c) are correct.

Question 21.17

4. Blood pressure tends to fall with increasing distance that blood has traveled from the heart. Based on this information, which of the following lists the types of blood vessel, in order, from highest blood pressure to lowest?

  • a) veins, arteries, capillaries
  • b) arteries, capillaries, veins
  • c) veins, capillaries, arteries
  • d) capillaries, veins, arteries
  • e) arteries, veins, capillaries