ch 20 animals

chapter 20 animals pearson biology campbell
Compact, complex animals have internal exchange surfaces that are extensively branched or folded, providing a large
surface area
In the digestive system nutrients are
absorbed across the many fingerlike projections of the lining of the intestine
in the respiratory system
oxygen and carbon dioxide are exchanged across the epithelial linings of sacs at the tips of tiny air tubes
in the urinary system
wastes are removed from the blood across the epithelial linings of excretory tubes.
The circulatory system
transports materials between the exchange surfaces of the other organ systems and body cells
Body cells are bathed in interstitial fluid, and exchange
body cells and the blood takes place through this fluid
groups of cells that are similar in structure and perform a common or related function
groups of tissues that perform a particular job in an organism.
organ system
group of organs that work together to perform a specific function
compact, complex animals have specialized internal
exchange surfaces that provide a large surface area
The protective covering of the body is called the
integumentary system
is the regulation of internal conditions w/i a range that supports life's processes
Most of the control mechanisms that maintain an internal steady state are based on
negative feedback in which a change in variable triggers mechanisms that reverse that change
Which of the following is an organizational level that encompasses many organ systems working together?
What are the four major categories of tissues?
nervous, epithelial, connective, and muscle
Epithelial tissue is involved in _____.
interior lining of blood vessels
Muscle cells contract. This is possible because of _____.
contractile proteins
Voluntary body movements involve _____.
skeletal muscle
Which of the following is the primary function of the nervous tissue?
rapid communication of signals
Homeostasis is the _____.
maintenance of a relatively constant internal environment
What type of epithelium would you expect to find covering a surface subject to physical forces?
stratified epithelium
What type of epithelial tissue, found in the intestines, absorbs nutrients?
simple columnar epithelium
Which of these tissues, found in the lungs, permits gas exchange by diffusion?
simple squamous epithelium
What type of epithelial tissue lines kidney tubules?
simple cuboidal cells
The type of epithelium that lines the inside of your cheeks (within your mouth) is _____.
stratified squamous epithelium
How does connective tissue differ from the other three major tissue types?
Connective tissue often consists of relatively few cells embedded in an extracellular matrix.
Which of these describes loose connective tissue?
It is a loose weave of fibers that functions as a packing material.
Cartilage is found _____.
at the ends of bones such as the femur
_____ is the connective tissue specialized for transport.
What type of muscle is responsible for contractions of the digestive tract and arteries?
smooth muscle
Cardiac muscle is the only muscle composed of _____ fibers.
_____ muscle is attached to bones.
Skeletal muscles are attached to bones by _____, which are made of _____.
tendons ... fibrous connective tissue
A neuron consists of _____.
dendrites, a cell body, and axons
Nervous tissue functions _____.
to sense stimuli
Which of the following tissues is responsible for food absorption in the small intestines?
columnar epithelium
Severe burn victims often receive artificial skin grafts. Why?
Skin normally provides a protective barrier between the body and infectious microorganisms in the environment.
Which organ system regulates the water balance of the blood?
excretory system
A physician wishes to assess the metabolic activity of a patient's brain. Which imaging technique should she choose?
PET scan
In addition to the integrity of the integumentary system, what other component of the skin protects against bacterial infection?
oil gland
The goal of homeostasis is the _____.
maintenance of internal conditions within a limited range
If blood sugar is under homeostatic control using negative feedback, what will happen if blood sugar levels drop between meals?
Blood sugar will begin to rise until it reaches an appropriate value.
Which of the following is a correct match of cell type with structure
muscle cell ... has proteins that slide back and forth
__________ are the fundamental units of life.
Which of the following options lists the structural elements of organisms in the correct order, from smallest to largest?
cells, tissues, organs, organ systems, organisms
The heart is an example of a(n) ___________
The heart pumps blood through blood vessels to reach all areas of the body. Together, the heart and blood vessels form a(n) __________.
organ system
What aspect of a bird's wings would be most interesting to a physiologist?
role of feather barbs in flight
In terms of hierarchy of organization, organs fall between _____ and _____.
tissues ... organ systems
the study of the physical structural features of the organism
the study of the functions of body parts
A tissue
is a group of similar cells which have a particular structure and work together to carry out a specific job.
Epithelial tissue:
covers the body surface and lines internal organs and cavities
Connective tissue:
binds different tissues and provides support through an extracellular matrix
Muscle tissue :
contracts for movement
Nervous tissue:
communicates among body parts
Simple squamous epithelium
is only one cell layer thick, permitting gases to diffuse between the blood and the lungs.
Simple cuboidal epithelium
is also one cell layer thick, forming tiny tubules that allow the blood to be easily filtered in the kidneys.
Simple columnar epithelium
has a single layer of elongated cells that are specialized for absorption of nutrients in the intestine.
Stratified squamous epithelium
has several layers of cells. It is located wherever the body needs protection from abrasion, like inside your esophagus or the surface of your skin.
Pseudostratified squamous epithelium
secretes mucus to trap pathogens and debris before they can enter your lungs, and has cilia to sweep them upward and out of your respiratory tract.
a matrix
consisting of a web of fibers embedded in either a liquid, jelly, or solid, depending on the type of connective tissue.
Loose connective tissue,
the most common type in the human body, binds skin to underlying muscles and holds internal organs and tissues in place. has both tough collagen fibers and stretchy elastic fibers
Fibrous connective tissue
is made of long tough parallel fibers that resist stretching—useful for tendons and ligaments!
Adipose tissue
is specialized to store fat. It cushions internal organs, provides insulation, and acts as the body's energy reserve
is smooth and slippery. It covers the ends of bones, allowing them to slide past each other when you move your joints.
Bone tissue
provides strength and support. It also acts as a calcium and phosphorus "bank," storing these minerals until the body "withdraws" them as needed.
is a liquid connective tissue that transports substances like oxygen and nutrients to the cells that need them, and carries away carbon dioxide and other wastes.
Skeletal muscle
is attached to bones. It is made of long parallel cylindrical cells. It is voluntary—that is, you can choose to contract it or not.
Cardiac muscle
is made of branched, interconnected cells that can communicate with each other. It is involuntary—you can't consciously control its contraction.
Smooth muscle
is made of spindle-shaped cells that also communicate with each other. It also contracts involuntarily, to move substances through the body—like in the intestine.
nervous tissue
tissue that receives messages from the body's external and internal environment, analyzes the data, and directs the response
damaged tissue
When a tissue is injured, the body replaces the damaged tissue by mitosis (except in types like cartilage and cardiac muscle, which do not regenerate).
Several tissues working together to carry out specific functions
Organ Systems
Several organs can be integrated to work together as an organ system.
Circulatory System
Transports oxygen and nutrients to the cells.
Transports carbon dioxide and wastes away from the cells for excretion
Respiratory System
Exchanges gases with the environment.
Supplies blood with oxygen and disposes of carbon dioxide.
Integumentary System
Protects against mechanical injury, infection, excessive heat or cold, and drying out.
Skeletal System
Supports the body.
Protects certain internal organs, such as the brain and lungs.
Provides the framework for muscles to produce movement.
Muscular System
Skeletal muscles produce movement, maintain posture, and produce heat.
Urinary System
Removes nitrogen-containing waste products from the blood.
Regulates the chemical makeup and water balance of the blood.
Digestive System
Ingests and breaks down food into smaller chemical units to be used as fuel for cellular respiration.
Eliminates undigested material.
Endocrine System
Secretes hormones that regulate body activities such as digestion, metabolism, growth, reproduction, heart rate, and water balance.
Lymphatic and Immune Systems
Returns excess body fluid to the circulatory system.
Defends the body against infections and cancer.
Nervous System
Coordinates body activities by detecting stimuli, integrating information, and directing the body's responses.
Reproductive Systems
Produce gametes and sex hormones.
Female system includes organs to support a developing embryo and glands for producing milk.
CT (computed tomography)
Useful as a diagnostic tool- for example, for detecting brain hemorrhage, tumors, heart defects, or blocked blood vessels.
MRI (magnetic resonance imaging)
Useful for observing soft tissue, especially if surrounded by bone.
MRM (magnetic resonance microscopy)
Useful in studying the development of embryonic organ systems.
PET (positron-emission tomography)
PET scans can be used to study diseases affecting the brain such as stroke, Alzheimer's, and epilepsy.
Despite large fluctuations in external environment (for example, temperature extremes), homeostatic mechanisms regulate an animal's internal environment, resulting in much smaller fluctuations.
Negative Feedback
Most of the control mechanism of homeostasis are based on negative feedback, in which a change in a variable, such as temperature, triggers mechanisms that reverse the change.