Unit 9 MSK pt. 2 Patho Flashcards

1
Q

Neural reflex pathways can be classified in different ways: Describe the efferent division the controls the effector. (1st) (What do somatic motor neurons control and Autonomic neurons control)

A

A) somatic motor neurons control skeletal muscles

B) Autonomic neurons control smooth and cardiac muscle, glands, and adipose tissue

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2
Q

Neural reflex pathways can be classified in different ways: Describe the integrating region within the CNS. (2nd) (Spinal and cranial reflex)

A

A) Spinal reflexes do not require input from the brain

B) Cranial reflexes are integrated within the brain

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3
Q

Neural reflex pathways can be classified in different ways: Describe the time at which the reflex develops. (3rd)

A

A) Innate (inborn) reflexes that are genetically determined

B) Learned (condition) reflexes are acquired through experience

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4
Q

Neural reflex pathways can be classified in different ways:Describe the number of neurons in the reflex pathway. (4th) (Monosynaptic and Polysynaptic)

A

A) Monosynaptic reflexes only have two neurons: one afferent and one efferent
{Only somatic motor can be monosynaptic} (Patellar tendon reflex)

B) Polysynaptic reflexes include one or more interneurons between the afferent and efferent neurons.
{Autonomic reflexes are polysynaptic} (Arm being pulled away from noxious stimulate, like a hot stove)

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5
Q

In polysynaptic reflex, compare divergence and convergence.

A

Divergence of pathways allows a single stimulus to affect multiple targets

Convergence integrates the input from multiple sources to modify the response

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6
Q

What are autonomic reflexes?

A

Known as visceral reflexes, often involve internal organs of the body. Some visceral reflexes such as urination and defecation are spinal reflexes that take place without input of brain, through excitatory or inhibitory signals

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7
Q

Where are autonomic reflexes integrated in the brain? What are the functions?

A

Primarily in the hypothalamus, thalamus and brain stem

They coordinate body functions needed to maintain homeostasis, such as HR, BP breathing, eating, water balance and maintaining body temp.

Brain stem also contains integrating centers for autonomic reflexes such as vomiting, salivating, sneezing, swallowing, and gagging

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8
Q

What is the limbic system in charge of?

A

The site of primitive drives such as sex, fear, rage, aggression, and hunger- has been call the “visceral brain” because it’s in charge of emotional driven reflexes
(Gut-feeling, and “butterfly’s in stomach”)

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9
Q

What are the three proprioceptors found in the body?

A

Joint Receptors

Golgi Tendon organ

Muscle spindles

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10
Q

Describe joint receptors (one of the proprioceptors)

A

Found in the capsules and ligaments around joints in the body. Sensory information is integrated primarily in the cerebellum. They are stimulated by mechanical distortion and changes in relative positioning of bones linked by flexible joints

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11
Q

Describe Golgi Tendon Organ (GTO) (One of the proprioceptors)

A

Found at the junction of tendons and muscles fibers. GTOs respond primarily to muscle tension created during the isometric phase of contraction and are relatively insensitive to muscle stretch.
Muscle contraction pulls on collagen fibers within the GTO, pinching sensory endings of the afferent neurons and causing them to fire

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12
Q

Describe muscle spindles. (One of the proprioceptors)

A

Stretch receptors the send information to the spinal cord and brain about muscle length and changes in muscle length. They are small, elongated structures scattered among and arranged parallel to the contractile extrafusal muscle fibers.

Each spindle consist of a connective tissue capsule that encloses the infrafusal fibers. The reflex pathway in which muscle stretch initiated a contraction response is known as a stretch reflex

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13
Q

What are extrafusal fibers?

A

Fibers that build up, generate force and execute movement. Innervated by alpha motor neuron

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14
Q

What are infrafusal fibers?

A

Fibers that are part of the muscle spindles- sensory receptors for muscle control and movements. Innervated by gamma motor neurons

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15
Q

What is Alpha gamma coactivation?

A

Gamma motor neurons keep muscle spindles active no matter what the muscle length is. When alpha motor neurons fire, muscle shortens which releases tension on muscle spindle capsule. Gamma motor neurons then come in to active and shorten the spindle. This excitation of both gamma and alpha motor neurons at the same time is known as alpha gamma coactivation.

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16
Q

How are stretch reflex and alpha gamma coactivation activated during plyometric exercise?

A

The stretch reflex will lead to strong contraction and the alpha-gamma activation helps the muscle spindles detect the stretch reflex otherwise, the muscle spindle intrafusal muscle would not detect the quick stretch without being taut or contracted as well as gamma neurons.

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17
Q

How will a PNF quick stretch technique facilitate a muscle contraction?

A

Because it helps induce the alpha gamma coactivation that leads to extrafusal and intrafusal fibers to reinforce contraction and possibly make it stronger.

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18
Q

Explain patellar tendon reflex.

A

It’s a monosynaptic reflex, a rubber hammer is hit below the knee cap, tendon pulls on bone of patella and contracts quad muscle attached to patella.

This contraction of quads while hamstrings relaxes causes the leg to kick out. When the knee goes back to flexion, it requires the hamstrings to contract and for the quads to relax

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19
Q

Explain the cross extensor reflex.

A

(Stepping on a Lego) Divergence

A flexion reflex causes extension of the opposite limb, this contraction of reflexes with postural adjustments is essential for maintaining balance.

Flexors contract moving foot away from painful experience

Extensors contract as weight shifts to other leg

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20
Q

What is reciprocal inhibition and what neurons are responsible for it?

A

Reciprocal inhibitions is when antagonists flexor muscles relaxes during the contraction of the agonist muscle. ( hamstring relaxes while quad contracts)

Somatic motor neurons are activated to contract quads

Inhibitory interneurons suppresses activity in somatic motor neurons controlling hamstring

21
Q

What are voluntary movements?

A

The most complex type of movement. It requires integration of the cerebral cortex and can be initiated without external stimuli. (Muscle memory). For example, riding a bike.

22
Q

What are Rhythmic movements?

A

It is a intermediate complex movement. A combination of reflex and voluntary movements. Initiated by input from the cerebral cortex. For example, walking or running.

23
Q

What are Feedforward reflexes?

A

The least complex type of movement. Allows the body to prepare for a voluntary movement and be used to create a smooth, continuous motion

24
Q

Where are Voluntary movements integrated from?

A

In the cerebral cortex

25
Q

Where are Rhythmic movements integrated from?

A

Integrated in the spinal cord with higher center input required.

26
Q

Where are Feedforward Reflexes integrated from?

A

Integrated at the level of the spinal cord or brain stem with higher center modulation.

27
Q

What is the role of the spinal cord in Neural control of movement?

A

Spinal reflexes; Locomotor pattern generators

28
Q

What is the role of the Brian Stem in Neural control of movement?

A

Posture; Hand and eye movements

29
Q

What is the role of the Motor areas of the Cerebral Cortex in Neural control of movement?

A

Planning and coordinating complex movement

30
Q

What is the role of the Cerebellum in Neural control of movement?

A

Monitors output signals from motor areas and adjust movement

31
Q

What is the role of the Thalamus is Neural control of movement?

A

Contains relay nuclei that modulate and pass messages to cerebral cortex

32
Q

What is the role of the Basal Ganglia is Neural Control of movement?

A

Motor Planning

33
Q

What is Parkinson’s Disease?

A

A progressive neurological disorder characterized by abnormal movements, speech difficulties, and cognitive changes.

34
Q

What are the signs and symptoms associated with in Parkinson’s Disease?

A

They are associated with loss of neurons in the basal ganglia that release the neurotransmitter dopamine.

Tremors in hands, arms and legs, particularly at rest

Shuffling gait

Lost facial expression

Depression, personality changes

35
Q

Where does ATP come from for muscle contraction?

A

-A small amount is in the muscle fiber when contraction begins.
-Phosphocreatine (PCr) transforms energy to ADP to ATP, which replenishes the muscle supply of ATP.

36
Q

What nutrients yield the most energy per gram when metabolized?

A

Carbohydrates (Glucose) and fatty acids.

37
Q

Explain excess-post exercise oxygen consumption.

A

Oxygen is being used to
-metabolize lactate,
-restore ATP and PCr,
-replenish the oxygen bound to myoglobin,
-and increase body temp. and circulating catecholamines

38
Q

What type of energy is used for endurance training?

A

Aerobic= Glucose + Fats and is supported for a long duration. For Example, a marathon runner.

39
Q

What type of energy is used for resistance training?

A

Anaerobic = Glucose - Faster ATP production but it is brief. For example, Sprinters or power lifters.

40
Q

Where does glucose for aerobic and anaerobic ATP production come from?

A

Three sources:
-Plasma glucose pool
-Intracellular stores of glycogen in muscles and liver
-“New” glucose made in the liver through gluconeogenosis

41
Q

What is the difference between Aerobic, Anaerobic, and Phosphocreatine metabolism?

A

Aerobic metabolism supports exercise for hours.

Anaerobic produces ATP 2.5 times faster than aerobic metabolism but can support only one minute of maximal exercise.

Phosphocreatine can sustain only 10 seconds of maximal exercise.

42
Q

What changes occur in mitochondria with exercise?

A

Oxygen is consumed during the oxidative phosphorylation in the mitochondria, as it combines with hydrogen to form water.

Also the definition of Oxygen consumption

43
Q

How is oxygen consumption related to exercise intensity?

A

A person’s maximal rate of oxygen (VO2 max) is an indicator of the ability to perform endurance exercise. The greater the VO2 max, the greater the person’s predicted ability to do work.

44
Q

What is the advantage of decreased insulin secretion during exercise?

A

Less insulin means that cells other than muscle fibers reduce their glucose uptake, sparing blood glucose for use by muscles.

45
Q

How is blood redistribution during exercise?

A

During exercise blood flow to tissues increases due to:
-Increased cardiac output
-Increased vasodilation in skeletal muscles arterioles
(Sympathetic signals cause vasoconstriction in peripheral tissues at the onset of exercise, but as muscles become active O2 decreases, while temperature and CO2 increases so it induces vasodilation).

46
Q

Explain the normal ranges in Systolic BP, Diastolic BP, and HR and ventilation during exercise.

A

As cardiac output increases significantly during exercise, BP increases whether peripheral resistance decreases (vasodilation) or increases (Vasoconstriction).

Ventilation rates jumps as soon as exercise begins

47
Q

How is heat lost form the body during exercise?

A

Most of the energy released during metabolism is released as heat. With continued exercise, heat production exceeds heat loss, and core body temp. rises, which result in sweating and increased cutaneous blood flow.

48
Q

How may exercise improve type 2 diabetes mellitus?

A

With exercise, skeletal muscle fibers up-regulate the number of GLUT4 glucose transporters and insulin receptors on their membrane. Due to this, the muscles dependence on insulin for glucose uptake decreases and helps correct the hyperglycemia of diabetes.