NAME

Question Types


Start With


Question Limit

of 33 available terms

Advertisement Upgrade to remove ads

5 Written Questions

5 Matching Questions

  1. Stretch and Contraction
  2. Chemical Regulation of the Heart
  3. Regulation of Heart Rate- Autonomic NS
  4. Cardiac Output- example
  5. Cardiac Cycle- Duration
  1. a Length of cycle- .8sec
    -average 75 beats/min
    -atrial systole .1 sec
    -ventricular systole- .3 sec
    -remaining .4 total- heart relaxation termed "quiescent period"
  2. b Skeletal muscle at rest is near its optimal length for max. tension
    Cardiac muscle at rest is shorter...
    -therefore inc. stretch inc. contractile force
    Anything inc. vol. or speed of venous return- inc. SV
    -HR, exercise, etc.
  3. c Chemicals in blood and body fluids can alter cardiac function
    Hormones
    -epinephrine- released by adrenal medulla
    -enhances HR and contractility
    -Thyroxine- thyroid hormone
    -inc. metabolic rate and body heat
    -slow sustained inc. in HR
    -also enhances effects of epinephrine
  4. d Autonomic NS Regulation (extrinsic factor regulating the heart)
    Under stress, fright, anxiety, excitement
    -sympathetic fibers release norepinephrine
    -binds to B1- andrenergic receptors
    -causes threshold to be reached quicker- pacemaker fires more rapidly faster beat
  5. e CO (ml/min)= HR (75 beats/min) x SV (70 ml/beat)
    Normal blood volume- 5 Liters
    Entire blood volume through heart every minute
    Co is highly variable
    -altered by SV or HR or both
    Cardiac Reserve
    -maximal CO- Resting CO
    -Cardiac reserve (normally) 4-5 times greater than resting CO
    -Athletes about 7x greater than resting CO

5 Multiple Choice Questions

  1. Contraction
    - ejection of blood
  2. Ventricular Systole
    -atria relaxed- ventricles start contraction phase
    -ventricular pressure rises rapidly
    -Back pressure closes the AV valves
    -"isovolumetric Contraction Phase"
    -briefly ventricle closed off chambers and blood vol. is constant
    -Ventricular pressure exceeds pressure in arteries
    -semilunar valves are forced open
    -ends isovolumetric contraction phase
    -ventricular ejection phase
    -blood leaves ventricle and enters aorta and pulmonary trunk
    - aortic pressure reaches 120 mmHG
    -In left side of heart
  3. Both divisions of the autonomic NS send impulses to the heart
    The dominant influence is inhibitory termed 'Vagal Tone'
    -cutting the 'vagal nerve' (parasympathetic input removed) causes a quick inc. in beats/min
  4. Higher pressure is required to move through entire body. Right side pumps only to the lungs
  5. Blood flow through the heart is controlled by pressure
    Blood flows along a pressure gradient
    -always high to low pressure
    Keeps blood flowing in only 1 direction

5 True/False Questions

  1. Stroke Volume (SV)Contraction
    - ejection of blood

          

  2. Cardiac Cycle- Phase 1(Atrial Systole)Ventricular Systole
    -atria relaxed- ventricles start contraction phase
    -ventricular pressure rises rapidly
    -Back pressure closes the AV valves
    -"isovolumetric Contraction Phase"
    -briefly ventricle closed off chambers and blood vol. is constant
    -Ventricular pressure exceeds pressure in arteries
    -semilunar valves are forced open
    -ends isovolumetric contraction phase
    -ventricular ejection phase
    -blood leaves ventricle and enters aorta and pulmonary trunk
    - aortic pressure reaches 120 mmHG
    -In left side of heart

          

  3. Cardiac Cycle- Phase 2 (Ventricular Filling)Ventricular Systole
    -atria relaxed- ventricles start contraction phase
    -ventricular pressure rises rapidly
    -Back pressure closes the AV valves
    -"isovolumetric Contraction Phase"
    -briefly ventricle closed off chambers and blood vol. is constant
    -Ventricular pressure exceeds pressure in arteries
    -semilunar valves are forced open
    -ends isovolumetric contraction phase
    -ventricular ejection phase
    -blood leaves ventricle and enters aorta and pulmonary trunk
    - aortic pressure reaches 120 mmHG
    -In left side of heart

          

  4. Afterload- Back pressureBack pressure of aortic and pulmonary valve must be over come by ventricle to open valves and eject blood
    -80 mm Hg (aorta)
    -8 mm Hg (pulmonary)

          

  5. Complete Cardiac CycleAtrial- systole and diastole
    ventricular- systole and diastole

          

Create Set