Biology - Chapter 7: Structural Organisation in Animals

Understanding Animal Tissues and Basic Anatomy of Frog

1. Animal Tissues Overview

Animals have four major types of tissues, each specialized for different functions:

Tissue	Function	Examples
🧱 Epithelial Tissue	Protection, absorption, secretion	Skin, lining of organs
🔗 Connective Tissue	Support and connection	Blood, bone, cartilage
💪 Muscular Tissue	Movement and locomotion	Cardiac muscle, skeletal muscle
⚡ Nervous Tissue	Transmission of signals	Brain, neurons

💡 Quick Concept: Epithelial = covering Connective = support Muscular = movement Nervous = control

2. Important Questions & Answers

Q1. What are the characteristics of epithelial tissue?

Answer: Epithelial tissues form the outer covering of the body and inner lining of organs. Cells are tightly packed with very little intercellular space. They are mainly of two types: simple and compound.

Types of Epithelial Tissue

Q2. Why is connective tissue called "connective"?

Answer: Because it connects and supports different tissues and organs. Blood is a fluid connective tissue that transports nutrients.

Q3. Difference between tendon and ligament?

Answer:
• Tendon: Connects muscle to bone • Ligament: Connects bone to bone

Q4. What is special about cardiac muscle?

Answer: Cardiac muscles are found in the heart. They contract rhythmically without fatigue and have intercalated discs.

Q5. Name the respiratory organs of frog.

Answer:
1. Skin (cutaneous respiration) 2. Buccal cavity 3. Lungs (pulmonary respiration)

Respiratory System of Frog

Q6. What are the main parts of a neuron?

Answer:
• Cell Body • Dendrites (receive signals) • Axon (transmits signals)

Q7. Explain the circulatory system of frog.

Answer: Frog has a closed circulatory system. Its heart is three-chambered (2 atria + 1 ventricle). RBCs contain nucleus.

🔥 Exam Booster: Remember → Frog = 3 chambered heart + mixed blood circulation

⬅ Previous Chapter Next Chapter ➡