Analyze the following scenario: A patient is experiencing difficulty breathing due to weakened diaphragm muscles. Which type of muscle is the diaphragm classified as?
Connective tissue
Skeletal muscle
Smooth muscle
Cardiac muscle
The Correct Answer is B
A. Connective tissue: Connective tissue provides structural support and connects other tissues, but it does not contract to produce movement. It cannot generate the force needed for breathing.
B. Skeletal muscle: The diaphragm is a skeletal muscle that contracts voluntarily and involuntarily to facilitate breathing. Its rhythmic contraction increases thoracic volume, allowing air to enter the lungs.
C. Smooth muscle: Smooth muscle is found in the walls of internal organs and blood vessels, controlling involuntary movements such as peristalsis, but it is not involved in respiratory mechanics.
D. Cardiac muscle: Cardiac muscle is found only in the heart and is responsible for pumping blood. It does not participate in ventilation or diaphragm movement.
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Related Questions
Correct Answer is B
Explanation
A. Transport blood from the lungs to the heart: This is the role of the pulmonary veins, which carry oxygenated blood from the lungs to the left atrium, not the coronary arteries.
B. Supply oxygenated blood to the myocardium: Coronary arteries branch from the aorta and deliver oxygen-rich blood directly to the heart muscle, ensuring the myocardium receives the nutrients and oxygen required for continuous contraction.
C. Pump blood into the systemic circulation: Pumping blood into the systemic circulation is the function of the left ventricle, not the coronary arteries.
D. Remove carbon dioxide from the cardiac tissue: While venous drainage removes metabolic waste, this is primarily the role of coronary veins, not the coronary arteries.
Correct Answer is D
Explanation
A. Organism: An organism is the complete living being, composed of multiple organ systems working together. It is not the basic structural or functional unit.
B. Organ: An organ is a collection of tissues that performs a specific function, but it is made up of cells, which are the fundamental units.
C. Tissue: Tissue is a group of similar cells performing a common function. While important, tissues are composed of cells and not the most basic unit.
D. Cell: The cell is the smallest structural and functional unit of life. It carries out essential processes such as metabolism, energy production, and reproduction, forming the foundation of all living organisms.
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