뒤로Animal Form and Function: Structure, Tissues, and Organ Systems
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Animal Form and Function
Relationship Between Structure and Function
The form (structure) of an organism is closely related to its function (what it does). Evolution shapes anatomical structures to suit the environment and lifestyle of each species.
Key Point: Structures are adapted for specific functions. For example, bird wings are adapted for flight, and shark fins are adapted for swimming.
Example: The streamlined body of a fish reduces water resistance, aiding in swimming efficiency.
Tissues in Animals
Definition and Types of Tissues
Tissues are groups of similar cells that work together to perform a specific function. In animals, there are four main types of tissues:
1. Epithelial Tissue: Covers body surfaces, lines internal cavities, and forms glands. Examples: Skin, lining of the intestine.
2. Connective Tissue: Connects, supports, and protects other tissues and organs. Examples: Bone, blood, cartilage, fat (adipose tissue).
3. Muscle Tissue: Responsible for contraction and movement. Examples: Skeletal muscles, cardiac muscle (heart), smooth muscle (digestive tract).
4. Nervous Tissue: Detects changes and transmits signals throughout the body. Examples: Brain, nerves, spinal cord.
Levels of Organization in Animals
From Cells to Organism
Cells form tissues
Tissues form organs
Organs form organ systems
Organ systems make up the organism
This organization allows for increasing complexity and specialization of function.
Organ Systems in Animals
Major Organ Systems and Their Functions
Multiple organs work together in organ systems to perform vital functions. Each system contributes to homeostasis—the maintenance of a stable internal environment.
Organ System | Main Organs | Functions |
|---|---|---|
Tegumentary | Skin, hair, nails | Protection, prevents water loss, regulates temperature |
Skeletal | Bones, cartilage, joints | Support, protection, movement, mineral storage |
Muscular | Muscles | Movement, posture, heat production |
Digestive | Mouth, stomach, intestines, liver, pancreas | Breaks down food, absorbs nutrients, eliminates waste |
Circulatory | Heart, blood, blood vessels | Transports oxygen, nutrients, hormones; removes CO2 and wastes |
Respiratory | Lungs, trachea, bronchi | Gas exchange: O2 in, CO2 out |
Nervous | Brain, spinal cord, nerves | Coordinates and controls rapid responses |
Endocrine | Glands (e.g., pituitary, thyroid) | Long-term regulation (growth, metabolism, reproduction) via hormones |
Excretory/Urinary | Kidneys, ureters, bladder | Eliminates wastes, regulates water and salts |
Reproductive | Ovaries/testes, associated organs | Produces gametes and sex hormones; reproduction |
Integration of Organ Systems
All organ systems work together to maintain the health and function of the organism.
If one system fails, the entire body can be affected.
Summary of Biological Organization
Cells → Tissues → Organs → Organ Systems → Organism
This hierarchy moves from simple to complex structures and functions.
Additional info: - Homeostasis is a central concept in physiology, referring to the body's ability to maintain stable internal conditions despite external changes. - Examples of homeostasis: Regulation of body temperature, blood glucose levels, and pH balance.
