--Bonecells that remain alive in a matrix hardened with calciumphosphate
bone removing cells that dissolve the mineral component of the bone matrix, playing a major role in bone resorption
bone forming cells
Parts of the Blood
Plasma: extracellular fluid
Red blood cells: ethrocytes
White blood cells: leukocytes
Where does muscle tissue originate from?
Which muscle type is under voluntary control?
Characteristics and examples of smooth muscle tissue
–Foundin walls of blood vessels and visceral organs
–Containa single nucleus
Characteristics and examples of skeletal muscle
–Usuallyattachedto bone by tendons,so muscle contraction causes bones to move
–Musclefibers (cells) aremultinucleated
–Contractby means of myofibrils,which contain ordered actin and myosin filaments
Characteristics of cardiac muscle
–Eachwith a single nucleus --Gap junctions link adjacent cells
Where is nerve tissue derived from?
What are neuron support cells called?
What is the purpose of neuroglia?
–Donot conduct electrical impulses
–Supportand insulate neurons and eliminate foreign materials in and around neurons
–Associatewith axon to form an insulating cover called the myelinsheath
•Gaps(nodes of Ranvier) are involved in acceleration of impulses
Whichthreeorgan systems detect external stimuli and coordinate the body’sresponses?
Nervous,sensory, and endocrine systems
Which two organ systems are involved in support and movement?
Muscle and skeletal
What organ systems are responsible for maintenance and regulation?
–Digestive,circulatory, respiratory, and urinary systems
What organ systems are responsible for defense?
Immune and integumentary
The dynamic constancy of the internal environment Ex: inhabitants of brackish water, being able to live in both concentrations of salt to water ratio
How does homeostasis work?
-Changing conditions are detected bysensors -Information is fed to an integratingcenter -Comparesconditions toa set point -Info is sent to hypothalamus which determines whether hormones must be released to change internal environment
–Enhance a change in one direction – no antagonistic counterpart – not common
–These do not in themselves maintain homeostasis
–Important components of some physiological mechanisms
•Contraction of uterus during childbirth
Feed forward system
Anticipatory reaction Ex: hearthe wind blowing, see frost on the window, feel that the room is colder thannormal. So, sensory receptors tell us that it’s cold outside. **Has no feedback component
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