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Questions and Answers
What is the shape of the muscle cells in the muscular system?
What is the shape of the muscle cells in the muscular system?
- Spherical
- Rectangular
- Longitudinal, spindle-shaped (correct)
- Cylindrical
What is the function of the cytoplasmic part of a muscle cell?
What is the function of the cytoplasmic part of a muscle cell?
- To store nutrients
- To facilitate contraction
- To regulate body temperature
- To contain the nucleus and connect to the nerve cord (correct)
Where do the nerve appendages from the muscle cells connect to?
Where do the nerve appendages from the muscle cells connect to?
- The brain
- The spinal cord
- The peripheral nervous system
- Either the dorsal nerve cord or the ventral nerve cord (correct)
What is the contractile part of a muscle cell responsible for?
What is the contractile part of a muscle cell responsible for?
What is the role of the nucleus in a muscle cell?
What is the role of the nucleus in a muscle cell?
What is the main purpose of the four longitudinal lines on the body of the parasite?
What is the main purpose of the four longitudinal lines on the body of the parasite?
What type of lines are the dorsal and ventral lines?
What type of lines are the dorsal and ventral lines?
How many longitudinal lines are present on the parasite's body?
How many longitudinal lines are present on the parasite's body?
What can be inferred about the lateral lines based on the information provided?
What can be inferred about the lateral lines based on the information provided?
Which of the following systems is most closely related to the four longitudinal lines on the parasite's body?
Which of the following systems is most closely related to the four longitudinal lines on the parasite's body?
What is the shape of the muscle cells in the longitudinal muscle fiber layer?
What is the shape of the muscle cells in the longitudinal muscle fiber layer?
What is the function of the contractile part of a muscle cell in the longitudinal muscle fiber layer?
What is the function of the contractile part of a muscle cell in the longitudinal muscle fiber layer?
What structure does the nerve appendage of a muscle cell connect to?
What structure does the nerve appendage of a muscle cell connect to?
Where is the nucleus located in a muscle cell of the longitudinal muscle fiber layer?
Where is the nucleus located in a muscle cell of the longitudinal muscle fiber layer?
What is the main function of the cytoplasmic part of a muscle cell in the longitudinal muscle fiber layer?
What is the main function of the cytoplasmic part of a muscle cell in the longitudinal muscle fiber layer?
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Study Notes
Muscular System Structure
- The muscular system consists of longitudinal, spindle-shaped muscle cells.
- Each muscle cell has a contractile part and a cytoplasmic part containing a nucleus.
- From the cytoplasmic part, a nerve appendage connects to either the dorsal nerve cord or the ventral nerve cord.
Longitudinal Lines and Muscle Fiber Layer
- Four longitudinal lines run along the entire body, defining the internal muscle: • Two white lines: dorsal line and ventral line • Two wider and darker lines: lateral lines
- The longitudinal muscle fiber layer is composed of spindle-shaped muscle cells, each with: • A contractile part • A cytoplasmic part containing a nucleus • A nerve appendage connecting to either the dorsal nerve cord or the ventral nerve cord
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