Chapter 4, Problem 3MC

An open circulatory system (a) is characteristic of squids and other active mollusks (b) permits contracting muscles to recover quickly (c) has no blood vessels (d) is a unique characteristic of annelids (e) has hemolymph, which bathes tissues directly

Among living animals, only birds have ________. a. a cloaca c. feathers b. a four-chambered heart d. amniote eggs

The pectoral girdle supports the_______. a. arms b. legs c. skull d. thoracic cage

Which of the following characteristics does not contribute to powered flight in birds? a. a lightweight skeleton b. efficient respiratory and circulatory systems c. enlarged forelimbs and a keeled sternum d. a high metabolic rate that releases energy from food rapidly e. scaly skin on the legs and feet

What is the function of the hormone erythropoietin? a. stimulates production of red blood cells b. stimulates muscle growth c. causes the fight-or-flight response d. causes testosterone production

1. During the embryonic period, the lungs first appear at about the A. 10th day after fertilization B. 24th day after fertilization C. 6th week after fertilization D. 12th week after fertilization

Which of the following characteristics is associated with mollusks? (a) mandibles (b) mantle (c) pedipalps (d) chelipeds (e) setae

Which body region of an insect bears the walking legs? a. head b. carapace c. abdomen d. thorax e. trunk