Although derived from three germ layers, the __________ lack coeloms
A) Cnidarians
B) Platyhelminths
C) Rotifers
D) Nematodes
Fill in the blank with the correct answer.
Answer: A
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Technically, the peritoneal cavity:
A) contains all the intraperitoneal organs. B) is a closed cavity in both sexes. C) is the potential space between the parietal and visceral peritoneum. D) is typically open to the testis in the male. E) contains lymph nodes.
The major components of the lymphatic system include the __________.
a. thoracic duct, right lymphatic duct, and lymph nodes b. spleen, thymus, and tonsils c. lymph nodes, lymph, and lymphocytes d. lymphatic vessels, lymph, and lymphatic organs
The aging process causes all of the following effects on the integumentary system EXCEPT ________.
A. increased skin elasticity B. increased skin delicacy C. increased likelihood of multiple skin lesions D. increased likelihood of skin cancer
The thoracic cavity contains the
A) coelom. B) pericardial cavity. C) pelvic cavity. D) pleural cavities. E) pericardial and pleural cavities.