All vertebrates have _______ .
a. a closed circulatory system b. a two-chambered heart c. lungs d. hemolymph |
Introduction:
The vertebrates are the organisms that are characterized by the presence of the solid backbone which is a bony structure that extends from the neck to the abdomen. It is absent in the invertebrates which makes them easily distinguishable from the vertebrates.
Answer to Problem 1SA
Correct answer:
All vertebrates have closed circulatory system. Hence, the correct answer is option a.
Explanation of Solution
Reason for correct answer:
Option a. is given as, “closed circulatory system.”
The invertebrates have an open circulatory system in which the blood is present freely in the body cavity while in the vertebrates, it is confined to the blood vessels.
Reason for incorrect answer:
Option b. is given as, “two-chambered heart.”
The vertebrates can have two, three or four-chambered heart. The number of chambers in the heart is not the defining feature of vertebrates. Hence, option b. is incorrect.
Option c. is given as, “lungs.”
Not all vertebrates have lungs. The fishes respire through gills, and they are members of vertebrates. So, the presence of the lungs does not define the vertebrates. Hence, option c. is incorrect.
Option d. is given as, “hemolymph.”
Hemolymph is the mixed fluid present in animals like Arthropods and Molluscs. It is an important constituent of their unique open circulatory system. The hemolymph helps to exchange the nutrients and the waste products from the body. It is not present in vertebrates. Hence, option d. is incorrect.
Hence, the options b., c., and d. are incorrect.
The presence of a closed circulatory system is a unique character of vertebrates. The vertebrates contain blood vessels, capillaries and a pumping organ known as the heart in their circulatory system. Thus, the correct option is a.
Want to see more full solutions like this?
Chapter 33 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
- In the evolution of the vertebrates , the myocytes provide the stem cells for a) smooth mucscles that surround some of the capillaries to form arteries and veins b) inducing specialization of the ethodelial cells of the liver c) inducing the specialization of the ethodelial Beta cells of the pancreas d) inducing the speacialization of the epithelial cells of in the development of brain and spinal cord e) All of these are truearrow_forwardThe systemic circuit of mammals______ . a. carries blood to the lungs and back b. is shorter than the pulmonary circuit c. carries blood to body tissues and back d. allows oxygenated and oxygen-poor blood to mixarrow_forwardWhich animals lack a true circulatory system?a. cnidarians c. nematodesb. flatworms d. All of these are correct.arrow_forward
- Which of the following statements about vertebrate circulatory systems is not true? A. In mammals, the blood pressure in the aorta is higher than the pressure in the pulmonary artery. B. In fishes, oxygenated blood from the gills returns directly to the heart through the left atrium. C. In birds, deoxygenated blood leaves the heart through the pulmonary artery. D. In reptiles, the blood in the pulmonary artery has a lower oxygen content than the blood in the aorta. E. In amphibians, deoxygenated blood enters the heart through the right atrium.arrow_forwardWhich of the following groups has a three-chambered heart?a. birds c. mammalsb. reptiles other than birds d. amphibiansarrow_forwardThe muscles of an entropneust (acorn worm) pericardium are responsible for, which of the following processes? Group of answer choices a. Blood flow. b. Coelom fluid circulation. c. Ultrafiltration. d. A & C.arrow_forward
- How does an open circulatory system differ from a closed one? A)A closed circulatory system is completely encased in the body cavity whereas the open one is not. B)The open circulatory system has a combination of blood vessels and large thin-walled sinuses whereas a closed circulatory system has only vessels. C)An open circulatory system opens into the heart whereas the closed circulatory system does not. D)An open circulatory system drains into the mantle cavity whereas a closed circulatory system drains into the hemolymph. E)An open circulatory system opens into arteries and is drained by veins whereas in a closed one it is just the reverse.arrow_forwardWhich sequence of blood flow can be observed in either a reptile or a mammal? right atrium → pulmonary artery → left atrium → ventricle left ventricle → aorta → lungs → systemic circulation right ventricle → pulmonary vein → pulmocutaneous circulation pulmonary vein → left atrium → ventricle → pulmonary circuit vena cava → right atrium → ventricle → pulmonary circuitarrow_forwardAnimals with open circulatory systems utilize a fluid called_______ that serves the function of both blood and_______ fluid. This fluid is passed among chambers in the body that are collectively calledthe_________ .arrow_forward
- How can aquatic arthropods have larger bodies than their terrestrial counterparts? A. Terrestrial arthropods lack a circulatory system. B. The circulatory system of aquatic arthropods is more efficient. C. Gas exchange across the body surface occurs more readily in aquatic environments. D. Buoyancy of the water can support heavier exoskeletons.arrow_forwardWhich of the following is not a function of the vertebrate circulatory system?a. regulation of body temperatureb. protection against injury, foreign toxins, and microbesc. transportation of materials in the bodyd. All of the above are functions of the circulatory system.arrow_forwardWhich of the following is false about open circulatory systems? Question 5 options: a) Movement of blood in an open circulatory system is relatively fast. b) Blood is in direct contact with all organs. c) Snails have an open circulatory system. d) There may be some blood vessels in organisms with open circulatory systems, but these tubes will not be closed on either end.arrow_forward
- Biology: The Unity and Diversity of Life (MindTap...BiologyISBN:9781305073951Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa StarrPublisher:Cengage LearningConcepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College
- Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning