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Chapter 44: Problem 4

Tracheal systems are characterized by: a. closed circulatory tubes that move gases. b. spiracles that move gases between cells and body fluids. c. body movements that compress and expand air sacs to pump air. d. positive pressure breathing, which swallows air into the body. e. negative pressure breathing, which lowers air pressure at the respiratory surfaces.

Short Answer

Expert verified
The feature characterizing tracheal systems is closed circulatory tubes that move gases. Therefore, the answer is (a).

Step by step solution

01

Analyzing the choices

Start with analyzing each option. The goal is to identify which one correctly describes the characteristics of tracheal systems.
02

Comparison with the Definition

Compare each of the given options to the primary characteristics of tracheal systems. Tracheal systems deliver oxygen directly to cells via branched, tube-like structures; they don't involve any 'breathing' in the way that larger organisms do, nor do they involve body movements to pump air.
03

Selection of correct choice

From these comparisons, it can be determined that option (a) 'closed circulatory tubes that move gases' correctly describes the method of gas exchange in a tracheal system.

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Most popular questions from this chapter

Oxygen enters the blood in the lungs because relative to alveolar air: a. the \(\mathrm{CO}_{2}\) concentration in the blood is high. b. \(\quad\) the \(\mathrm{CO}_{2}\) concentration in the blood is low. c. the \(\mathrm{O}_{2}\) concentration in the blood is high. d. the \(\mathrm{O}_{2}\) concentration in the blood is low. e. the process is independent of gas concentrations in the blood.

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A teenager is frightened when she is about to step onto the stage but then remembers to breathe deeply and slowly as she faces the audience. What is occurring here? Interneurons in the medulla cause the rib muscles to relax, followed later by stimulation and contraction of the intercostal muscles. b. Signals from the pons override the initial brain stem stimuli. c. The limbic system stabilized her emotional state, so there is no change in the mechanical movement of air. d. The brain signals the aortic bodies in the carotid arteries to adjust the breathing rate. \mathrm{e. } ~ I n i t i a l ~ l o w ~ C O ~ \(_{2}\) blood levels causing high pH are followed by increased \(\mathrm{CO}_{2}\) levels that lower \(\mathrm{pH}\).
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