Lab 25-29 Animal Organization and Homeostasis Flashcards
Levels of biological organization
- Cells
- Tissues
- Organs
- Organ systems
Major tissues in human body
- Epithelial
- Connective
- Muscular
- Nervous
Continuous layer over body surface and cavities
Epithelial Tissue
Function of the epithelial tissue
- Protection from infection, injury, and drying out
- May produce and release secretions, absorb nutrients
How are epithelial tissue arranged?
- Shapes
- Layers
Three shapes in epithelial tissue
- Squamous
- Cuboidal
- Columnar
Three layers of epithelial tissues
- Simple
- Stratified
- Pseudo stratified
Two different extensions of epithelial tissue
- Cellular extensions called microvilli
- Hair like extensions called cilia
Two kinds of connective tissue
- Connective tissue proper
2. Special connective tissue
Kinds of connective tissue proper
- Loose fibrous
- Dense fibrous
- Adipose tissue
Job of loose fibrous tissue
Binds organs together
Job of dense fibrous tissue
Tendons and ligaments
Job of adipose tissue
Insulation, fat storage, cushioning, and protection
Kinds of special connective tissue
- Bone
- Cartilage
- Blood
In bones of skeleton
Compact Bone
Chondrocytes in lacuna
Hyaline cartilage
Consists of plasma and cells
Blood
Job of muscular tissue
Contracts and is made of fibers
Three types of muscular tissue
- Skeletal
- Cardiac
- Smooth
Three characteristics of skeletal muscle
- Voluntary
- On muscles of skeleton
- Has striations
Three characteristics of cardiac muscle
- Involuntary
- Striations
- Branched fibers
- Intercalated discs
Three characteristics of smooth muscle
- Involuntary
- Walls of internal organs
- Spindle shaped
Structures composed of two or more types of tissues that work together to perform particular functions
Organ
Components of skin
- Epidermis
- Dermis
- Subcutaneous layer
What is epidermis composed of?
- Stratified squamous epithelial cells
- Outer cells are non living and create waterproof covering
- Inner layer is composed of living cells that produce new cells
What is the dermis composed of?
- Connective tissue region composed of blood vessels, nerves, sense organs, oil and sweat glands, and hair
What is the subcutaneous layer composed of?
- Loose connective tissue and adipose tissue
2. Insulates and protects inner body parts
Dynamic equilibrium of body’s internal enviroment
Homeostasis
Process of capillary exchange
- Cells, tissue fluid and blood exchange nutrients and wastes
- Occurs through thin walls of capillaries
- Glucose and oxygen are supplied to cells
- Carbon dioxide and other wastes are removed
What contribute to homeostasis?
Lungs, liver, and kidney
Alveoli are surrounded by ______
Capillaries
How do the lungs maintain homeostasis?
Gas exchange in lungs
Gas exchange occurs by diffusion of gases along a _______
Concentration gradient
What produces urea?
Liver
How does the liver maintain homeostasis?
Removes amino group from amino acids and converts it into urea nitrogenous end product
To regulate blood glucose level, after eating what happens?
- Blood glucose levels rise
- Pancreas secretes insulin to promote uptake of glucose from blood by liver and stores it as glycogen
To regulate blood glucose level, between meals what happens?
- Blood glucose levels drop
- Glucagon is released to promote breakdown of glycogen in liver and glucose is released to raise blood sugar level
How do kidneys maintain homeostasis?
Excrete nitrogenous wastes through urine formation
- regulates blood volume, blood pressure, and pH
Blood pressure causes small molecules to leave blood and become filtrate
Glomerular Filtration
Water and salt are passively reabsorbed
Reabsorption
Certain substances are actively secreted and hydrogen ions and ammonia
Tubular Secretion
Control of salt and water balance in the body
Osmoregulation
Four layers of the intestine
- Mucosa
- Submucosa
- Muscularis
- Serosa
When a heart chamber contracts
Systole
When a chamber relaxes
Diastole