a & p muscular system continued and nerves

Segment of myofibril from one z disc to the next

Sarcomere

Muscle shortening is due to blank shortening, pulling z discs closer to each other

Sacromeres

Skeletal muscle cannot blank unless stimulated by a blank

Contract

Nerve

Nerve cells that stimulate skeletal muscles

Motor neurons

Axons of blank leads to muscles

Motor neurons

Blank neurons go to multiple muscle fibers

Motor

(Motor neurons) each muscle cell receives only blank nerve cell

One

what is one motor neuron and all muscle fibers in supplies

Motor unit

All muscle fibers in a blank contract at once

Motor unit

This is where a nerve fiber meets a muscle fiber

Neuromuscular junction

Steps of muscle excitation

Nerve signals arrive at the synapse and stimulates synaptic vesicles, release acetylcholine

What stimulates a muscle fiber and released from neuron

Acetylcholine

steps of muscle excitation continued

Calcium is released into the cytosol of a muscle cell

where is calcium released

Into cytosol of muscle cell

Myosin heads blank to the active sits on the blank

Bind

Actin filaments

What is the link between myosin and actin called

Cross bridge

What is a power stroke

Myosin tugs the thin filament called a power stroke

during the relaxation there is no more

ACH

During relaxation- blank is reabsorbed by blank

Calcium

sarcoplasmic reticulum

The hardening of muscles and stiffening or body that occurs after death

Rigor mortis

What deteriorates after death releasing calcium

Sarcoplasmic

Two organ systems coordinate body activites

Nervous system and endocrine system

Noercouse systme is about

Sends messages to CNS

Receives and processes info

Processes informstion

The nervous system has two main anatomical subdivisions:

Central and peripheral nervous systems

Central nervous system consists of

Brain and spinal cord

Protection by cranium and vertebral column

Carries out integrative functions

Peripheral nervous system function

Sensory input from periphery to the brain

Motor output from brain to periphery

The sensory (blank) division carries signals from various receptors to CNS to provide information about stimuli

Afferent

The motor (blank) division carries signals from the CNS to structures such as muscles and glands

efferent

Afferent is for

Going to CNS

Efferent is for

Exiting

Nearuons have a blank where the blank is located

Cell body

Nucleus is located

Neuron has blank or more processes that each out to other cells

Two

What is the control center of neuron and contains nucleus

Cell body

Cell body has no blank cannot go under blank cell division

Centrioles , mitosis

What has fine branches

Dendrites

Where cells receives signals from other neurons

Dendrites

mound on the cell body, gives rise to the axon

Axon hillock

A long process that acts as an output pathway for signals to other cells

Axon

Most axons have blank never more than blank

One never more than one

Equal in number to neurons

Neuroglia (glial cells)

Perform protective and housekeeping functions

Aid neurons in their function

Neuroglia (glial cells)

How many types are in central nervous system ?

4

How many types are in peripheral nervous system ?

2

cells in CNS with arm like processes reaching out to nerve fiber/cell/neuron

Oligodendrocytes

What cells are responsible for myelin sheath?

Oligodendrocytes

cells that line internal cavities of the brain and spinal cords

Ependymal cells

What cells produce cerebrospinal fluid, fills cavities and bathes CNS

Ependymal cells

What are immune cells

Microglia

What are small phagocytes cells that wonder through CNS

Destroys tissue debris, microorganism, foreign matter

Microglian

Astrocytes do what

Form supportive structure

Control blood flow

Maintain stable environment for neurons

Satellite cells do what

Surrounds cell bodies and insulates neurons

Schwann cells do what

Wrap around nerve fibers of the PNS forming myelin sheath

Perform like Oligodendrocytes do in CNS