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The respiratory conducting passages are divided into the ________. A. Upper and lower respiratory tract B. Posterior and exterior respiratory tract C. Internal and external respiratory
tract D. Left and right respiratory tract
A. Upper and lower respiratory tract
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Asked 5/8/2012 10:25:02 AM
Updated 8/21/2012 8:26:57 AM
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A. Upper and lower respiratory tract
Added 8/21/2012 8:26:57 AM
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How is cardiac muscle similar to smooth muscle?
Weegy: Compared to skeletal muscle, smooth-muscle cells are small. They are spindle-shaped, about 50 to 200 microns long and only 2 to 10 microns in diameter. They have no striations or sarcomeres. [ Instead, they have bundles of thin and thick filaments (as opposed to well-developed bands) that correspond to myofibrils. In smooth-muscle cells, intermediate filaments are interlaced through the cell much like the threads in a pair of "fish-net" stockings. The intermediate filaments anchor the thin filaments and correspond to the Z-disks of skeletal muscle. Unlike skeletal-muscle cells, smooth-muscle cells have no troponin, tropomyosin or organized sarcoplasmic reticulum. ] (More)
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Expert Answered
Updated 5/12/2012 5:22:21 PM
3 Answers/Comments
Cardiac muscle is similar to smooth muscle in that both are involuntary.
Added 5/8/2012 10:34:06 AM
This answer has been added to the Weegy Knowledgebase
@smp0784-the user asked for a comparison of cardiac and smooth muscle not skeletal and smooth.
Added 5/8/2012 10:35:17 AM
@Frankie17851- Thank you for the correction.
Added 5/12/2012 5:22:21 PM
How is cardiac muscle similar to smooth muscle?
Weegy: Cardiac muscle is similar to smooth muscle in that both are involuntary. (More)
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Expert Answered
Asked 5/8/2012 9:37:08 AM
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What is the exchange of gases between the blood and tissue cells? A. Internal respiration B. Posterior respiration C. External respiration D. None of the above
Weegy: A. Internal respiration is the exchange of gases between the blood and tissue cells User: What is the larynx commonly called? A. Voice box or epiglottis B. Vocal cord C. Voice box or glottis D. Vocal ligament (More)
Question
Updated 8/3/2012 6:39:34 AM
1 Answer/Comment
C. external respiration
Every 3 to 5 seconds, nerve impulses stimulate the breathing process, or ventilation, which moves air through a series of passages into and out of the lungs. After this, there is an exchange of gases between the lungs and the blood. This is called external respiration.
Added 8/3/2012 6:39:34 AM
Rated good by rohan1
What is the first activity of the digestive system? A. Digestion B. Ingestion C. Movement D. Absorption
Weegy: B. Ingestion User: What is the trachea commonly called? A. Voice box B. Vocal cord C. Windflute D. Windpipe (More)
Question
Updated 5/8/2012 10:39:22 AM
1 Answer/Comment
D. Windpipe. The trachea, commonly known as the windpipe, is a tube about 4 inches long and less than an inch in diameter in most people.
Added 5/8/2012 10:39:22 AM
Which organ is a part of the digestive system? A. Heart B. Kidneys C. Lungs D. Anus User: What is the exchange of gases between the lungs and the blood? A. Internal respiration B. Posterior respiration C. External respiration D. None of the above
Question
Updated 5/8/2012 10:37:35 AM
1 Answer/Comment
D. Anus is a part of the digestive system.

A. Internal respiration is the exchange of gases between the lungs and the blood.
Added 5/8/2012 10:37:35 AM
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