gen bio

• Muscular system


  Composed of specialized cells called muscle fibers
• Muscular system


  • Permits movement of the body
  • Maintains posture
  • Circulates blood throughout the body
• The Three Types of Muscle

  • Cardiac
  • Skeletal
  • Smooth
• Cardiac Muscle


  Cardiac muscle tissue, or myocardium, is a specialized type of muscle tissue that forms the heart
• Cardiac Muscle


  • Involuntary muscles that contract rapidly but do not get fatigued
  • Control the contraction and relaxation of the heart
• Skeletal Muscle


  • Comprise 30 to 40% of your total body mass
  • Are voluntary, meaning you control how and when they work
• Skeletal Muscle


  • Muscles that connect to your bones
  • Maintain posture and stabilize bones and joints
  • Protect the vital organs in the body
  • Control internal movement, and generate heat
• Smooth Muscle


  They are involuntarily regulated, not striated, not branched, and have a single nucleus
• Smooth Muscle


  • Used in vessels to maintain blood pressure and flow
  • In the lungs, it opens and closes airways
  • In the gastrointestinal, motility and nutrition collection
• Skeletal system


  Made up of your bones and creates the support structure for the rest of your tissue and organs
• Skeletal system


  • Gives your body shape, supports your muscles, provides movement, and makes red blood cells
• Skull


  Provides protection and structure to the brain and orbits of the eyes
• Rib


  • The ribs form the main structure of the thoracic cage protecting the thoracic organs
  • Aids respiration
• Pelvis


  Protects internal reproductive organs, the urinary bladder, and the lower part of the digestive tract
• Femur


  Holding the weight of your body when you stand and move
• Fibula


  Combines with the tibia and provide stability to the ankle joint
• Endocrine system


  • A complex network of glands and organs
  • A messenger system comprising feedback loops of the hormones released by internal glands of an organism directly into the circulatory system, regulating distant target organs
• Pituitary gland


  • Plays an important role as a "controller"
  • Often referred to as the "master gland"
  • Also secretes antidiuretic hormone (ADH)
• Thyroid gland


  • Secretes triiodothyronine (T3) and thyroxine (T4)
  • Regulates weight, energy levels, internal temperature, skin, hair, nail growth, metabolism
• Adrenal gland


  • Secretes adrenaline
  • Adrenaline triggers the body's fight-or-flight response
  • Plays a role in metabolism, attention, focus, panic and excitement
  • Abnormal levels of adrenaline are linked to sleep disorders, anxiety, hypertension and lowered immunity
• Pancreas


  • Secretes insulin and glucagon
  • Glucagon keeps blood glucose from dropping too low
  • Insulin is produced to keep blood glucose from rising too high
• Ovaries


  • Secretes estrogen and progesterone
  • Estrogen regulates the menstrual cycle
  • Progesterone prepares the body for pregnancy in the event that the released egg is fertilized
• Testicles


  • Secretes testosterone
  • Testosterone is an androgen that are produced in the testes
  • Responsible for the development of male accessory sex organs
  • Regulates spermatogenesis and libido in males
  • Regulate bone mass, fat distribution, muscle mass, and strength