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Introduction:
There are three different types of muscle in the body, the cardiac, skeletal, and the smooth muscles. The muscles help in the movement of different body parts. They protect delicate organs from various injuries and provide shape to the body. The skeletal muscles particularly help in the movement of organs. There are 600 skeletal muscles in our body.
Answer to Problem 1TYK
Correct answer:
One body part rotates with respect to another body part.
Explanation of Solution
Justification/explanation for the correct answer:
Option (c) states that one part of the body may rotate with respect to another part. The skeletal muscles are attached to the bones from both sides of the muscles. Contraction in one muscle helps in the movement of different body parts. This depends on the point of attachment of the muscle. Hence, option (c) is correct.
Explanation for the incorrect answer:
Option (a) states that skeletal muscles are attached to bones with the help of ligaments. This statement is incorrect because skeletal muscles are attached to the bones with the help of cords of connective tissue known as tendons. So, it incorrect.
Option (b) states that bending of the vertebrate muscles do not extend the body parts. The extension of the body parts depends on the point of attachment of the vertebrate muscles to the bones by the tendons, so it extends the body parts according to the point of attachment. So, it incorrect.
Option (d) states that skeletal muscles are present in the walls of blood vessels and intestines. The smooth muscles are present in the walls of blood vessels, body cavities, and intestines. The skeletal muscle is stiff so it is not present in cavities or walls of blood vessels. So, it incorrect.
Option (e) states that cells of the skeletal muscles do not contain nuclei. This statement is incorrect because the nuclei are present in the cells of the skeletal muscles. It is also controlled by the somatic nervous system of our body so the nuclei must be present as it plays an important role in a cell. So, it incorrect.
Hence, options (a), (c), (d), and (e) are incorrect.
The skeletal muscles of our body are connected by tendons to different bones. The skeletal muscles help in the movement our body parts such as eyeballs, legs, hands, and so on. The movement of one body part may rotate another body part, depending upon the point of attachment of the muscle.
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Chapter 43 Solutions
Biology: The Dynamic Science (MindTap Course List)
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- Which of the following statements regarding skeletal muscle is NOT true? Skeletal muscle is responsible for overall body motility. Skeletal muscle can contract rapidly and can maintain the contraction for long periods of activity .Skeletal muscle can exert tremendous power. Skeletal muscle is called voluntary muscle because it is the only type subject to conscious control.arrow_forwardWhich of the following muscle types and characteristic is correctly matched? Group of answer choices Cardiac muscle : dense body anchoring proteins Skeletal muscle : varicosity at neuromuscular junctions Smooth muscle : Calcium-calmodulin regulation of myosin light chain kinase Cardiac muscle : calcium only from the sarcoplasmic reticulumarrow_forwardWhich of the following best describe skeletal muscle tissue? O It is under involuntary control. O It is striated and lines the walls of internal organs. O It is under voluntary control and contains intercalated discs O It is striated and contains multiple nuclei.arrow_forward
- Which of the following is NOT a function of the muscular system? O Maintains posture and body position O Produces movement of the skeleton by pulling on tendons Circulates blood and nutrients throughout the body Maintains body temperaturearrow_forwardTetanus is a disease caused by Clostridium tetani characterized by muscle spasms. Just like the toxin produced by Clostridium botulinum, this toxin produced by C. tetani interferes with muscle contractions. Where botulina toxin causes paralysis, C. tetani toxin causes muscle spasms and painful contractions lasting minutes at a time. Additional symptoms include stiffness and rigidity of muscles. Using your knowledge of how muscles contract explain what steps within a muscle contraction are being interfered with to cause these symptoms?arrow_forwardWhich of these does NOT apply to smooth muscle cells? actin and myosin filaments are arranged in sacromeres calcium is required for contraction to occur during contraction myosin proteins attach to and pull on actin cells can divide to replace neighboring cells that are injured or destroyedarrow_forward
- Complete the table below. Write the structural features depending on the type of muscle tissue. Muscle Skeletal Cardiac Smooth Fiber Diameter Presence/Absence of Striations Nuclei Sarcoplasmic Reticulum Presence of Transverse Tubules Cell Junctions Visceral: Multi-unit: Connective Tissue Componentsarrow_forwardPlace the steps leading to muscle contraction in the correct order. Calcium allows myosin to bind to the actin. A message travels down the axon of a nerve. Myosin pulls on the actin causing the muscle to shorten. An electrical wave of the action potential travels across the muscle cell and deep into the interior of the cell. The end of the axon of the nerve releases the neurotransmitter, acetylcholine. The electrical charge causes calcium to be released into the cytoplasm of the muscle. The neurotransmitter, acetylcholine travels across the space between the axon ending and the muscle. The neurotransmitter, acetylcholine, binds to receptors on the muscle.arrow_forwardLimiting Weights is the exercise that stimulates muscles to become stronger. As muscles gain in…. Which of the following processes occurs at the cellular level? Mitochondria is added to aid in ATP production. More calcium is released with each action potential. Larger diameter myochorils are added to each cell.arrow_forward
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