Lab 4-Cardiovascular system-physiology
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Lab 4-Cardiovascular system-physiology
Cardiovascular system physiology
Blood moves fastes in which vessel? Why?
Artery because of pressure
Blood moves slowest in which vessel? Why?
Capillaries because the stream is not constant-precapilary sphincter
Considering a corresponding artery and vein which has a smaller diameter? Why?
Artery because of pressure and return flow
The change in blood volume with each cardiac cycle
Heart rate and blood flow
Speed (faster or slower) change in time (HR)
Forms a small second peak adter the first major peak if the volume pulse recording
Caused by elastic rebound/respiration
The slope of the rising edge of the volume pulse is much steeper than the slope of the falling edge. Why?
Rising=active contaction following relaxation= passive
What changes in the finger are repressented by the amplitude changes?
TIme at peak Y - Time at peak X = Elapsed time
5 beats/elapsed time x 60 sec/min = HR (bpm)
Does the ampolitude rande increase or decrease right after excersize? Why?
Decreases; less blood flow through fingers more diverted to muscles
WHat does the change in volume pulse amplitude and hr indicate about changes in the volume of blood flowing in the finger?
Decreases amplitude=decrease in blood flow
How does the amplitude of the colume pulse for the cooled finger compare with the recording at normal room temp?
Explain the difference in terms o the effect of cold on peripheral blood vessels?
Vaso constriction in decreased temp
What happens to the volume pusle amplitude when the finger is heated?
Increases due to vaso dilation
Effects of smoking
Increases peripheral vasoconstriction
What receptors and where are they?
nicotinic colnergic; sym and parasym post ganglionic neurons
Where can you feel for the pulse?
: groove medial to the styloid process of the radius
: the side of the neck
: on the temple above and to the outside of the eye
: inner side of the biceps
: behind the knee
Sphygmomanometer- instrument used to indirectly measure peripheral blood pressure that consists of
Compression bag surrounded by an unyielding cuff for application of the extra-arterial pressure.
Mercury manometer or pressure gauge by which applied pressure is read.
Blub for inflation od the cuff in order to create pressure in the system.
Valve to release the air from the cuff.
Attachments for connectin the cudd to the manometer and bulb.
Peak blood pressure measured during ventricular systole
First sound heard when releasing pressure
Minimum blood pressure at the end of ventricular diastole
Pressure at which sound stops
What pressure do you pump the cuff to when taking bp?
Where do you place the cuff and the stethoscope?
: 1 in above the antecubital space (elbow)
: over brachial artery below the cuff
Difference between systolic and diastolic pressure
Pt has edema in the extremities. Which ventricle is damaged?
Right b/c lower than normal pressure causes pooling (edema)
Left would cause edema of the lungs
5000ml blood with 500ml blood loss. What cardiovascular changed would occur?
Decrease in blood pressure
Heart rate beats faster
Vasomotor reflex-hypovolemic shock
5000ml blood with 500ml blood loss. Continual blood loss. What is expected to happen?
: outer connective tissue
: inward extensions of the capsule
: no whirls
: purple whirls
Located left side under ribs
Lymph node slide
: outer region of the node
: globular masses
: inner region of the node
Located tonsils, GI tract, vaginal canal
Amywhere that has contact to the outside environment
Lymphoid Nodule slide
Peyers patches: darkly stained purple circles
: top (posterior wall nasopharynx)
: middle (oral cavity/pharynx junction)
: bottom (near base of tongue)
Dumps into right atria
Medial to the spleen
Cervical lymph nodes
Submandibular lymph nodes
Axillary lymph nodes
Inguinal lymph node
Why are the tonsils located where they are at?
To protect against airborne pathogens
Why do the cervical lymph nodes become swollen and tender during a bad cold or sinus infection?
Increased production of lymphocytes