15 Questions
What is the shape of the muscle cells in the muscular system?
Longitudinal, spindle-shaped
What is the function of the cytoplasmic part of a muscle cell?
To contain the nucleus and connect to the nerve cord
Where do the nerve appendages from the muscle cells connect to?
Either the dorsal nerve cord or the ventral nerve cord
What is the contractile part of a muscle cell responsible for?
Facilitating movement
What is the role of the nucleus in a muscle cell?
To store genetic information
What is the main purpose of the four longitudinal lines on the body of the parasite?
To define the internal muscle structure
What type of lines are the dorsal and ventral lines?
Narrower and lighter
How many longitudinal lines are present on the parasite's body?
Four
What can be inferred about the lateral lines based on the information provided?
They are wider and darker than the dorsal and ventral lines
Which of the following systems is most closely related to the four longitudinal lines on the parasite's body?
Muscular System
What is the shape of the muscle cells in the longitudinal muscle fiber layer?
Spindle-shaped
What is the function of the contractile part of a muscle cell in the longitudinal muscle fiber layer?
To contract and move the body
What structure does the nerve appendage of a muscle cell connect to?
Dorsal or ventral nerve cord
Where is the nucleus located in a muscle cell of the longitudinal muscle fiber layer?
Cytoplasmic part
What is the main function of the cytoplasmic part of a muscle cell in the longitudinal muscle fiber layer?
To synthesize proteins and contain organelles
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
Learn about the structure and components of the muscular system, including muscle cells and nerve connections.
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