Reflejos Condicionados y Teorías del Aprendizaje

Reflection of waves: Waves in matter: Physics: GCSE (9:1)

8.2 and 9.2 Intro to Reflective Practice and Reflective Models

Reflectie en ervaringsleren

Reflections, Rays, and Waves Study Set

Reflection, Refraction, Diffraction Practice

Les verbes reflechis : sens idiomatique

Physics Light – Reflection and Refraction

Total Internal Reflection

1. Miastenia Gravis: La falla en la comunicación neuromuscular La Miastenia Gravis (MG) no es un problema del músculo en sí, sino de la transmisión de la señal nerviosa hacia él. Es una enfermedad autoinmune y fluctuante. ¿Dónde ocurre? En la membrana postsináptica de la unión neuromuscular. El nervio suelta la acetilcolina (el mensajero), pero el músculo no puede recibirla correctamente. Los culpables (Anticuerpos): El sistema inmune destruye los receptores. El documento menciona tres tipos: Anti-AChR (85%): Los más comunes. Anti-MuSK (10-15%): Suelen dar cuadros más severos, con mucha afectación de cara, cuello y músculos respiratorios. Anti-LRP4 (5%): Casos más leves. Nota clínica clave: Que los análisis salgan negativos (seronegativa) no descarta la enfermedad. Clínica (El día a día del paciente): La palabra clave aquí es fatigabilidad. El paciente se levanta bien, pero a medida que usa los músculos, se agotan. Ptosis y Diplopía: Párpado caído y visión doble (los músculos oculares son los primeros en afectarse). Crisis Miasténica: Es la complicación más grave. El diafragma se debilita tanto que el paciente entra en paro respiratorio. Diagnóstico: Además del laboratorio y la electromiografía (EMG), destaca la Prueba del Hielo (el frío mejora temporalmente la transmisión neuromuscular y levanta el párpado caído) y la TAC de Tórax. Esta última es vital porque la MG está súper ligada a alteraciones del timo (hiperplasia o timoma), que es donde se "entrenan" mal esos anticuerpos. 2. Distrofias Musculares: El daño estructural del músculo A diferencia de la Miastenia, aquí el problema sí es estructural y genético. Es una distrofinopatía. La proteína ausente (Distrofina): Imagina que la distrofina es el "amortiguador" o el pegamento que protege la membrana de la célula muscular cada vez que se contrae. Sin ella, el músculo se rompe con el uso y se destruye progresivamente. Genética: Ligada al cromosoma X (Xp21). Las mujeres suelen ser portadoras sanas y los hombres desarrollan la enfermedad. Duchenne vs. Becker: Duchenne: Es la forma grave. No hay nada de distrofina. Inicia en la infancia temprana (2-3 años) y el deterioro es rápido. Becker: Es más noble. Hay distrofina, pero es defectuosa o insuficiente. Inicia más tarde (adolescencia o adultez) y progresa lento. Signos Clínicos Típicos: Debilidad Progresiva NO Fluctuante: Aquí no hay días buenos o malos como en la Miastenia; el músculo se va perdiendo. Empieza en la cintura pélvica. Signo de Gowers: Como los músculos de la pelvis y piernas están débiles, el niño tiene que "escalar sobre sí mismo" usando las manos para poder ponerse de pie. Pseudohipertrofia de gemelos: Las pantorrillas se ven grandes y fuertes, pero es un engaño; el músculo destruido fue reemplazado por grasa y tejido conectivo. Marcha Anserina: Camina balanceando la cadera de un lado a otro (como un pato) por debilidad del glúteo medio. Tratamiento: Se usan corticoides para retrasar la pérdida de fuerza y proteger la función pulmonar/cardíaca el mayor tiempo posible. 3. Parálisis Cerebral (PC): Lesión en un cerebro en desarrollo La PC es una lesión fija (no va a empeorar ni a extenderse), pero ocurre en un cerebro inmaduro, lo que altera el desarrollo motor de por vida. Los detonantes principales: El documento apunta directo a la prematurez (< 36 semanas) y al bajo peso (< 2500g). Los vasos sanguíneos de un bebé prematuro son sumamente frágiles; ante cualquier cambio de presión o falta de oxígeno (hipoxia), se rompen o se infartan las zonas cercanas a los ventrículos cerebrales (vía piramidal), dejando secuelas motoras. Clasificación según la zona dañada: 1 Espástica (80-85%): Daño en la corteza cerebral / vía piramidal. Los músculos están rígidos, tensos y los reflejos exagerados. Dependiendo de qué lóbulo o zona afecte, puede asociarse a epilepsia o problemas cognitivos. 2 Discinética/Atetoide (10-15%): Daño en los núcleos basales. Produce movimientos involuntarios, descoordinados y cambios bruscos en el tono muscular (pasa de rígido a flácido). Se relaciona con posturas distónicas o movimientos de corea. 3 Atáxica (5%): Daño en el cerebelo. El principal problema es el equilibrio, la coordinación de movimientos y el tono muscular bajo (hipotonía), acompañado a veces de nistagmus (movimiento involuntario de los ojos). Cambios estructurales visibles en imagen (USG/RMN): Destaca la atrofia periventricular, que lesiona directamente las fibras que controlan el movimiento de las piernas y brazos, y la ventriculomegalia (dilatación de los ventrículos por pérdida de tejido cerebral circundante)

Dawoud Bey - Untitled #13(Trees and Reflections), 2017

Color Mixing and Reflection Lecture

The reflection of light

Light- Reflection and Refraction

physics unit 7 (total internal reflection of waves)

Chapter 10: Light - Reflection and Refraction

AQA GCSE Physics Paper 2

Properties of Travelling Waves (reflection, refraction, diffraction, interference)

What are some examples of human behaviors that might be considered instinctual? Human instinctual behaviors include newborn reflexes (like grasping), fear responses (like loud noises or heights), bonding between parents and children, facial expressions (like smiling and crying), the fight-or-flight response, imitation, language learning ability, and the need for social connection. In Drive-Reduction Theory, what is meant by a “drive”? What about “homeostasis”? In Drive-Reduction Theory, a “drive” is an internal state of tension or discomfort caused by an unmet biological need, such as hunger or thirst, that motivates a person to act. “Homeostasis” refers to the body’s tendency to maintain a stable and balanced internal state, so behaviors are motivated by the desire to reduce drives and restore balance. How is the Arousal Theory different from Drive-Reduction Theory? Arousal Theory focuses on seeking an optimal level of stimulation, while Drive-Reduction Theory focuses on reducing biological needs. Arousal explains thrill-seeking; drive-reduction explains behaviors like eating when hungry. How does Maslow’s Hierarchy suggest we prioritize our goals? Maslow's Hierarchy of Needs suggests that people tend to prioritize basic needs before higher-level goals. According to the theory, physiological needs like food and sleep come first, followed by safety, love and belonging, esteem, and finally self-actualization, which involves reaching one’s full potential. The idea is that lower-level needs usually must be reasonably satisfied before a person focuses strongly on higher-level needs. Give a real-life example of each level of Maslow’s hierarchy. In Maslow's Hierarchy of Needs, physiological needs include food and sleep, safety needs include shelter and security, love and belonging involve friendships and family, esteem needs include confidence and respect, and self-actualization involves reaching personal goals and potential. Why might Maslow's theory be criticized across different cultures?+ù Maslow's Hierarchy of Needs may be criticized across cultures because it reflects individualistic values, such as personal achievement and self-actualization, which may not be prioritized equally in all societies. In some cultures, community, family, or group needs may be considered more important than individual goals. What is the difference between intrinsic and extrinsic motivation? Intrinsic Motivation comes from internal enjoyment or personal satisfaction, while Extrinsic Motivation comes from external rewards or pressures, such as money, grades, or praise. Which type of motivation do you think leads to more lasting change? Why? Intrinsic Motivation usually leads to more lasting change because the behavior is driven by genuine interest, enjoyment, or personal meaning, so it continues even without external rewards. Extrinsic Motivation can be effective in the short term, but the behavior often stops when rewards or pressure are removed, since the motivation depends on outside factors rather than internal commitment. What are the traits of someone with a high need for achievement? A person with a high need for achievement sets challenging but realistic goals, prefers tasks with clear personal responsibility, seeks feedback, and is persistent. They are motivated by doing well and improving rather than just external rewards. Why might low achievers choose tasks that are either very easy or very hard? People with a low need for achievement may choose very easy tasks because they are almost guaranteed success, which helps them avoid failure and protect their self-esteem. They may also choose very hard tasks because failure can be blamed on the difficulty of the task rather than their ability, which also protects their self-image. What role does the hypothalamus play in hunger? The hypothalamus helps regulate hunger by monitoring the body’s energy needs and signaling when to eat or stop eating. Different parts work together: one area triggers hunger when energy is low, while another signals fullness after eating. It responds to hormones, blood sugar levels, and signals from the stomach to maintain balance. What is the difference between set point theory and settling point theory? Set point theory says the body has a fixed, biologically controlled weight it tries to maintain. Settling point theory says weight is flexible and depends on lifestyle and environment, so it can change over time. What psychological and social cues can influence how much we eat? Psychological cues like stress, mood, and distraction can increase or decrease how much we eat. Social cues such as eating with others, portion sizes, and cultural expectations also strongly influence eating behavior. What are the symptoms of anorexia nervosa? Anorexia Nervosa includes extreme food restriction, significant weight loss, intense fear of gaining weight, and a distorted body image. It can also cause fatigue, dizziness, feeling cold, and in some cases, serious health problems. How does bulimia differ from anorexia? Bulimia Nervosa involves binge eating followed by purging and often normal weight. Anorexia Nervosa involves severe food restriction and very low body weight. How might perfectionism be linked to the development of eating disorders? Perfectionism can lead people to set unrealistically high standards for their body, weight, or eating habits, which increases stress and dissatisfaction. This pressure can contribute to restrictive eating or binge-purge behaviors as they try to “achieve” an ideal body image. According to James-Lange theory, what comes first: the emotion or the physical response? According to James-Lange Theory, the physical response comes first. The body reacts to a stimulus, and then the brain interprets those physical changes as an emotion. How does Cannon-Bard theory explain simultaneous emotion and bodily reaction? Cannon-Bard Theory says emotion and bodily reaction happen at the same time. A stimulus triggers the brain to send signals that produce both the emotional experience and the physical response simultaneously, rather than one causing the other. What evidence supports the idea that emotions are biologically universal? Evidence shows people across cultures recognize the same facial expressions, and even blind people show them, suggesting emotions are biologically universal. Similar brain activity patterns also support this idea. . What are Paul Ekman’s universal emotions? Paul Ekman identified six universal emotions: happiness, sadness, anger, fear, disgust, and surprise. How might facial expressions influence how we feel? Facial expressions can shape emotions through the idea that acting a certain way can influence how we feel internally. For example, smiling may increase feelings of happiness, while frowning can intensify sadness. Body and facial feedback to the brain helps reinforce or even create emotional experiences. Why is it important to recognize that emotions can be expressed differently across cultures? Paul Ekman shows some emotions are universal, but recognizing cultural differences matters because people can display and interpret emotions in different ways across cultures. Misunderstanding these differences can lead to miscommunication or incorrect judgments about others’ feelings or intentions

Fisiología Guyton Capítulo 55: Funciones motoras de la Médula Espinal - Reflejos Medulares | Quizlet