This MCQ module is based on: Animal Tissues — Epithelial, Connective, Muscular and Nervous
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Animal Tissues — Epithelial, Connective, Muscular and Nervous
🎓 Class 9
Science
CBSE
Theory
Ch 3 — Tissues in Action
⏱ ~13 min
🌐 Language: [gtranslate]
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Animal Tissues — Epithelial, Connective, Muscular and Nervous
Class 9 Science · Chapter 3 · Part 3 — The Four Animal Tissue Families
3.4 The Four Animal Tissues
Animal bodies have four major tissue families. Each is built for a specific job in a moving, fast-living body. They are: epithelial (covering and lining), connective (binding and supporting), muscular (movement) and nervous (control and coordination).
3.4.1 Epithelial Tissue — The Body's Wrapping
Epithelial tissue covers the outside of the body (skin) and lines the inside of every hollow organ, blood vessel and cavity. The cells are tightly packed without intercellular spaces and rest on a thin basement membrane.
🧫 Epithelial Identifier — Click each tissue type L1 Remember
The shape of an epithelial cell is a clue to its job. Click each of the four types to reveal where it sits in your body and the function its shape makes possible.
Click any of the four epithelial types above to reveal where it sits in your body and what job its shape allows.
| Type | Where Found | Function |
|---|---|---|
| Squamous | Lining of mouth, food pipe, blood vessels, lungs | Protection, easy diffusion |
| Cuboidal | Kidney tubules, salivary ducts | Secretion, absorption |
| Columnar | Inner lining of intestine | Absorption, secretion |
| Ciliated | Air passages, fallopian tubes | Move particles forward |
| Glandular | Sweat, salivary, hormone glands | Secretion of substances |
When epithelial cells fold inward and acquire the ability to secrete a substance like mucus, sweat, milk or hormones, they become a glandular epithelium.
3.4.2 Connective Tissue — The Body's Glue
Connective tissues bind, support, protect and transport. The cells lie loosely in a non-living matrix which can be jelly-like, fluid, hard or fibrous depending on the type.
Areolar tissue
Found between skin and muscles, around blood vessels and nerves. Fills space, supports organs and helps with repair.
Adipose tissue
Fat-storing tissue under the skin and around internal organs. Acts as an insulator and a shock absorber.
Dense regular connective tissue
Tightly packed parallel fibres make up tendons (joining muscle to bone) and ligaments (joining bone to bone).
Cartilage
Solid but flexible matrix. Found in nose tip, ear pinna, larynx, and ends of long bones. It smooths joint movement.
Bone
Hardest connective tissue. Matrix is rich in calcium and phosphorus salts. Bones form the skeleton, protect organs and store minerals.
Blood
A connective tissue with a fluid matrix called plasma. Plasma carries red blood cells (RBC), white blood cells (WBC) and platelets, plus dissolved nutrients, gases and wastes.
3.4.3 Muscular Tissue — Movement
Muscle cells (called fibres) are long and contain special proteins (actin and myosin) that help them contract. Three types exist.
Striated (skeletal / voluntary) muscle
Long, cylindrical fibres with light and dark bands (striations) and many nuclei. They are attached to bones and are under our control. Used in walking, lifting, writing.
Smooth (unstriated / involuntary) muscle
Spindle-shaped, single-nucleus fibres without bands. Found in stomach, intestines, blood vessels and the iris of the eye. They work without our conscious control.
Cardiac muscle
Cylindrical, branched fibres with single nucleus and faint stripes. Found only in the heart. They contract rhythmically throughout life and never tire.
3.4.4 Nervous Tissue — Control & Coordination
The fastest-acting tissue. Made of neurons that conduct electrical messages called nerve impulses.
A neuron has three main parts:
- Cell body — contains nucleus and cytoplasm.
- Dendrites — short branched projections that receive signals.
- Axon — a single long projection that carries signals away.
The point where one neuron's axon meets the next neuron's dendrites is called a synapse — the junction where the message jumps from cell to cell.
Speed of impulses: Nerve impulses can travel at speeds up to 120 metres per second along certain neurons — that is why your hand jerks back from a hot pan before you "feel" the burn.
Activity 3.3 — Mapping Animal Tissues to Daily ActionsL4 Analyse
Predict first: When you sip a cold drink, how many tissue types are likely to be involved between your lips and your stomach?
- Trace the journey of a sip of cold water from your mouth to your stomach.
- For each step (sucking, swallowing, food pipe, stomach), identify which tissue is responsible.
- Note when voluntary control ends and involuntary control takes over.
Lips and tongue use striated muscle (voluntary). Throat lining is squamous epithelium. The food pipe and stomach walls have smooth muscle (involuntary). Inner lining of stomach has columnar and glandular epithelium. Sensation is carried by nervous tissue. Many tissues; one simple sip!
Competency-Based Questions
A boy slips and tears the muscle fibres in his calf during football. The doctor says it will heal slowly because muscles do not regenerate as fast as skin epithelium. He also fractures a small bone, which heals on its own in a few weeks.
Q1. Why is bone called a connective tissue even though it is hard? L2
Bone has cells (osteocytes) lying in a non-living matrix made hard by calcium and phosphorus salts. Like all connective tissues, its job is to bind, support and protect.
Q2. Which type of muscle works in the stomach, and why is involuntary control useful there?
(b) Smooth muscle. Digestion can carry on continuously without us having to "think" about it, freeing the brain for other tasks.
Q3. Name the three parts of a neuron. L1
Cell body (with nucleus), dendrites (receive signals), axon (carries signal away to the next neuron).
Q4. Why does ciliated epithelium line the air passages of the lungs? L3
The cilia beat rhythmically and push trapped dust and mucus upward, away from the lungs, keeping them clean.
Q5. Differentiate between tendon and ligament. L2
A tendon joins a muscle to a bone and is very strong but slightly elastic. A ligament joins one bone to another at a joint and is strong but quite elastic to allow movement.
Assertion–Reason Questions
Choose: (A) Both A and R true and R explains A. (B) Both true but R does not explain A. (C) A true, R false. (D) A false, R true.
Assertion: Cardiac muscle works throughout life without getting tired.
Reason: Cardiac muscle has many mitochondria for continuous energy supply.
(A) — abundant mitochondria release a steady supply of ATP, so the heart never runs out of energy.
Assertion: Adipose tissue acts as an insulator.
Reason: Adipose tissue is rich in fat which is a poor conductor of heat.
(A) — fat blocks heat transfer, so the body retains warmth.
Assertion: Blood is a connective tissue.
Reason: Blood has cells lying in a fluid matrix called plasma.
(A) — both statements are true and the matrix-with-cells structure is exactly why blood qualifies as a connective tissue.
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