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Chapter 43
The Animal Body and Principles of Regulation
43
Biology
Undergraduate 1
01/28/2008

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Term
Germ Layers
Definition
The 3 cell layers formed at gastrulation of the embryo that foreshadow the future organization of tissues; they layers, from outside inwards, ard the ectoderm, mesoderm, and endoderm.
Term
Peritoneal Cavity
Definition
Th area in the abdomen that contains the stomach, liver, and bowels
Term
Thoracic Cavity
Definition
Chest cavity including the heart, lungs, trachea, area between the neck region and the diaphragm
Term
Endocrine Glands
Definition
Ductless glands that secrete hormones into the extracellular spaces, from where they diffuse into the circulatory system
Term
Exocrine Glands
Definition
A type of gland that releases its secretion through a duct, such as a digestive or sweat gland.
Term
Ground Substance
Definition
Matrix; Material in which cells of connective tissues are embedded
Term
Collagen
Definition
A fibrous protein that is a major constituent of connective tissue such as skin, tendons, ligaments, cartilage, and bone
Term
Elastin
Definition
Protein found with collagen in the dermis; is responsible for giving structure to skin and organs
Term
Reticulin
Definition
Structural fiber that acts as a supporting mesh in soft tissues such as liver, bone marrow, and the tissues/organs of the lymphatic system
Term
Fibroblasts
Definition
Cells found in the dermis that produce collage, elastin, matrix, and fibronectin
Term
Fibrocytes
Definition
Blood-borne cells with the ability to produce matrix
Term
Cartilaginous Fish
Definition
Fish with skeletons made of cartilage
Term
Chondrocyte
Definition
The only cells found in cartilage, which produce and maintain the extracellular matrix of cartilage
Term
Lacunae
Definition
Spaces within the collagen matrix
Term
Osteocytes
Definition
Mature osteoblasts; comprise bone matrix
Term
Osteoblasts
Definition
Bone-forming cells
Term
Osteoclasts
Definition
Break bone down
Term
Canaliculi
Definition
Small channels found in ossified bone
Term
Haversian Canal System
Definition
Narrow channels that run parallel to the length of a bone and contain blood vessels and nerve cells
Term
Muscle Fibers
Definition
Long, multinucleated cells found in skeletal muscles; made of myrofibrils
Term
Myrofibrils
Definition
Cylindrical organelles found within muscle cells
Term
Myrofilaments
Definition
Contractile microfilament, composed largely of actin and myosin; found within muscle
Term
Sacromeres
Definition
Fundamental unit of contraction in skeletal muscle; repeating bands of actin and myosin that appear between 2 Z Lines
Term
sliding Filament Mechanism
Definition
A model that demonstrates how myosin and actin work together to contract and/or release muscles
Term
Actin
Definition
One of the 2 major proteins that make up vertebrate muscle; the other is myosin
Term
Myosin
Definition
One of the 2 protein components of microfilaments (the other is actin); a principal component of vertebrate muscle
Term
T-Tubule
Definition
A deep invagination of the plasma membrane found in skeletal and cardiac muscle cells
Term
Neurotransmitter
Definition
Chemical released at the axon terminal of a neuron that travels across the synaptic cleft, binds a specific receptor on the far side, and depending on the nature of the receptor, depolarizes or hyperpolarizes a 2nd neuron or muscle gland
Term
Motor End Plate
Definition
The flattened end of a motor neuron that transmits neural impulses to a muscle
Term
Acetylcholine
Definition
A neurotransmitter released at automatic synapses and neuromuscular junctions
Term
Slow Twitch Fibers
Definition
Generate energy for ATP re-synthesis by means of a long term system of aerobic energy transfer
Term
Fast twitch fibers
Definition
Demonstrate higher capability for electromechanical transmission
Term
Tetanus
Definition
Sustained forceful muscle contraction with no relaxation
Term
Dendrite
Definition
A process extending from the cell body of a neuron, typically branched, which conducts impulses toward the cell body
Term
Axon
Definition
A process extending out from a neuron that conducts impulses away from the cell body
Term
Neuroglia
Definition
Nonconducting nerve cells that are intimately associated with neurons and appear to provide nutritional support
Term
Sensory Neuron (Afferent Neuron)
Definition
A neuron that transmits nerve impulses from a sensory receptor to the CNS or central ganglion
Term
Motor Neuron (Efferent Neuron)
Definition
Neuron that transmits nerve impulses from the CNS to an effector (typically a muscle or gland)
Term
Interneuron (Association Neuron)
Definition
A nerve cell found only in the middle of the spinal cord; acts as a functional link between sensory and motor neurons
Term
Hypothalamus
Definition
Region of the vertebrate brain just below the cerebral hemispheres, under the thalamus; a center of the ANS, responsible for the integration/correlation of many neural and endocrine functions
Term
Effector
Definition
An organ, such as a gland or muscle, that responds to a motor stimulation
Term
Stimulus
Definition
Any information coming into the body that is capable of generating a nerve impulse
Term
Sensor
Definition
A device that responds to a stimulus
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