Question 3
Describe the types of muscular tissue with examples.
Based on the structure and functions performed muscular tissues are of three types — Voluntary muscles, Involuntary muscles and Cardiac muscles.
- Voluntary muscles — These muscles are under our control or will. For example, we can control the muscles in our arms and legs when we run, walk or jump. These muscles are also called skeletal muscles as they are attached to the bones. These muscles help in the movement of the bones. The cells of these muscles are long and cylindrical with many nuclei and dark and light bands called striations. Hence, they are also called striated muscles.
- Involuntary muscles — They are present in the internal organs of our body like stomach, intestine, bladder etc. They are not under our control. The cells of these muscles are spindle-shaped and have only one nucleus. They do not have any bands or striations, hence these are also called unstriated muscles.
- Cardiac muscles — The heart is made up of special type of involuntary muscles called cardiac muscles. Cardiac muscles works continuously without getting tired. Structurally, these muscles resemble voluntary muscles . However, cardiac muscles are similar to involuntary muscles in their function.
Chapter 4: Tissue — ICSE Class VII Biology Notes
Complete ICSE Class VII Biology notes on Tissue covering meristematic and permanent plant tissues (parenchyma, collenchyma, sclerenchyma, xylem, phloem) and four animal tissue types with examples and diagrams.
Key Concepts and Topics
Topics covered: Meristematic tissue, Permanent tissue, Animal tissues, Xylem, Phloem
Weightage: Approximately 8 marks in the exam
Important Points to Remember
- Tissue: group of similar cells performing specific function
- Meristematic tissue: actively dividing cells at growth points
- Simple permanent: parenchyma (storage), collenchyma (flexibility), sclerenchyma (strength)
- Complex permanent: xylem (water up) and phloem (food both ways)
- Four animal tissues: epithelial, connective, muscular, nervous
- Three muscle types: skeletal, smooth, cardiac
- Blood is a connective tissue with liquid matrix
Frequently Asked Questions
Q: What is a tissue?
A: A tissue is a group of similar cells that perform a specific function together.
Q: What is the difference between xylem and phloem?
A: Xylem transports water upward and is made of dead cells. Phloem transports food in both directions and is made of living cells.
Q: Why is blood called a connective tissue?
A: Because it connects all body parts by transporting nutrients, oxygen, and waste, even though its matrix (plasma) is liquid.
Exam Preparation Tips
- Focus on understanding concepts rather than rote memorization
- Practice drawing and labelling diagrams regularly
- Use comparison tables for topics that require differentiation
- Solve previous year questions and practice papers
- Review the chapter notes provided by Bright Tutorials for comprehensive coverage
For complete chapter notes, practice questions, and test papers, contact Bright Tutorials at 9403781999.