Muscle Tissues and Nervous 4.4-4.5

Question 1

Membranes Physical Barrier Types

Answer 1

1. Mucous: exposed to environment ( lines passageways that communicate with the outsider) Epithelial surfaces are kept moist to reduce friction, facicilate absorption, secretion.
2. Serous: Line the sealed subdivisions of ventral cavity. Consist of mesothelium supported via aerolar tissue.
3. Cutaneous: skin, covers body surface. It has the stratified squamous epithelium, areolar tissue and underlying dense irregular.
4. Synovial: Found where two articulating bones meet. Ends of articulating bones lie within joint capsules with synovial fluid to reduce friction.

Question 2

Muscle

Answer 2

Skeletal
Cardiac
Smooth
Overall, muscles are vascular, cellular, movement, myofilamentrs cause movement.

Question 3

Skeletal

Answer 3

Structure: Elongated cells that are multi-nuceleated and the nuclei are located periphery. Striated
Location: attached to skeleton and skin
Function: voluntary movement, warm blood through byproduct of heat, locomotion, facial exp.

Question 4

Cardiac

Answer 4

Structure: central nuclei, striated, branching of muscle cells with intercalcated dics. Involun. control and has no external stimuli to contract. Decrease/increase in volume
Location: Heart
Function: contract cont. through autorythmic motion

Question 5

Smooth Muscle

Answer 5

Structure: No striations
Central nuclei with no striations
Cells are very close together form sheets.
Location: Digestive, urinary, utereus, blood wall vessles
Functions: involuntary perristalisis movements throughout the lining of digestive and utereus
- Vasodilation/Vasoconstriction for the involuntary contract and expand of blood vessles
- Bronchodialtion/ Bronchoconstriction: ( Bronchi movement)

Question 6

Peristalsis movements

Answer 6

Rhythmic contractions in uterus, digestive

Question 7

Nervous Tissues

Answer 7

Main componenet of nervous system
Main cell types:
1. Neurons: highly specialized nerves cells that conduct and make impulses.
2. Neuroglia: supporting cells, insulate neurons

Question 8

Neuron Structure

Answer 8

Motor Neuron
- Branching dendrites that carry and recieve impulse)
- The cell body brings impulse onto the axon
- Motor neuorns are myelinated and the axon carries impulse away. Myelin Sheath insulates, protects , speeds up impulse
brain, spinal cord, nerves

Question 9

CNS / PNS

Answer 9

CNS
1. Astrocytes ( most abundant)
2. Microgalia (defenders)
3. Epediyma Cells ( speinal fluid)
4. Oligoedeudrocytes
PNS
1. Satellite Cels
2. Schawaan Cells