Biology Lab Quiz 2 (copy)

epithelial tissue

• skin, mouth, glands

• functions: absorption, secretion, protection, filtration, excretion

• characteristics: cells packed close together, free surface, lays on top of base membrane, less matrix (space in between cells)

connectice tissue:

• most abundant

• functions: supports, protrcte, binds together, fastens together, connects

• characteristics: few scattered cells, lot of matrix, vascular

• example: blood, bone, ligaments, tendons, dermus

nerve tissue:

• functions: send electrical impulses

• 10^11 neurons in one

• 10^8 in CNS (central nervous system) = brain, spinal cord - motor neurons, take impulses to muscle

• PNS - senosry neurons, send impulses to the CNS

muscle tissue:

• functions: comtract (shorten upon applicayoon of stimulus)

• lot or blood vessels, stems

• proteins: (contractile) actin and myosin

• three types of muscle:

  • skeletal: striped, long cylindrical shape, multi nucleated, cover bones/ make up our flesh, voluntary (we control), controlled by cerebral/spinal nervous system

  • smooth (visceral): involuntary, long spindle shape, one nucleus, lines our guts/ blood vessels, controlled bt autonomic nervous system

  • cardiac: covers the heart, involuntary, controlled by SA node, single nucleus

tissue: when cells come together for a function

parts of the neuron:

• receptor: picks up the stimulus

• perikaryon: body of the neuron

• dendrites: branches, short, send impulses to the body

• axon: passes impulse to something else

spinal reflex: just happens, you dont think about it

autonomic nervous system: our stomach/guts

somatic nervous system: arms and legs

central nervous system: brain and spinal cord

• makes decisions

• interneurons

peripheral nervous system: takes impulses away

• sensory neuron (afferent): takes impulses to the CNS

• motor neuron (efferent): takes impulses from the CNS to the body

all movements come from the brain and spinal cord

irritability: ability to percieve and respond to a stimulus

conductivity: send a message to a body part

nervous system: controls our body by sending electrical impulses, four divisions