A person standing for long time develops swollen ankles when venous return is poor. Veins normally reduce this problem using:
Correct Answer: A. Valves and skeletal muscle assistance
MCQ Collection
Animal Form and Function-I MCQs
Practice Animal Form and Function-I questions with answers and explanations.
A student asks why the heart has valves. Heart valves mainly:
Correct Answer: A. Ensure one-way blood flow through chambers
A damaged capillary network in a tissue would most directly reduce:
Correct Answer: A. Exchange between blood and cells
A mammalian heart valve fails to close properly. The likely consequence is:
Correct Answer: A. Regurgitation or backflow of blood
An infection enters through a wound, but local inflammation limits its spread. The useful effect of inflammation is that it:
Correct Answer: A. Increases delivery of immune cells and defensive chemicals
A student compares immune barriers with internal defenses. Stomach acid is considered a:
Correct Answer: A. Chemical barrier of innate immunity
A student places a fish and a frog in separate moist chambers and observes gas exchange. The frog can use its skin more effectively because amphibian skin is:
Correct Answer: A. Thin, moist, and vascularized
A zoology demonstrator asks why cockroach dissection shows muscles attached to the body wall. The reason is that the body wall functions as:
Correct Answer: A. An exoskeletal support for muscle action
A closed circulatory system can support more active movement because it permits:
Correct Answer: A. Higher pressure and directed blood flow
Lymph differs from blood because lymph normally has:
Correct Answer: A. Less protein and no red blood cells in typical lymph
An animal with no circulatory system would be limited mainly by:
Correct Answer: A. Diffusion distance and body size
A student links immunity with circulation. Circulation improves defense because it:
Correct Answer: A. Transports immune cells and molecules to infection sites