Circulatory System #1 (Sun, June 23rd)

BTCSM Summer A&P
Dr. Dan Rovin
6.23.2024
Class 11 - Chapter 26 Circulatory System & Pathologies:
- The Circulatory System is comprised of 2 major systems - Cardiovascular & Lymph Vascular:
-
- Cardiovascular System: Cardio = heart. This system is critical for vitality. Death is determined
when the heart stops, because death to the brain
is only several minutes past the time that the
heart function ceases.
- This is the body’s delivery system, allowing fixed
cells within the body access to oxygen, nutrients,
immune cells, medication, and allowing waste
removal for elimination, etc.
- Lymph Vascular System: Removal and control of waste.
About the Heart:
- The heart has 4 ventricles (chambers): Begin
functioning embryologically and can be see working in an
ultrasound at around 21 days.
- Blood vessels are referred to as a highway system
- Arteries are like major Interstates, Veins like state
highways, and capillaries like residential streets.
- Transportation: Movement of material acquired by the
body and used for the body (ie: oxygen).
- Pathogen: Disease causing agent (virus, bacteria,
sources or trauma - such as radiation, etc.). Typically, we
focus on external pathogens such as the recent virus
causing COVID and the associated Pandemic.
Why is blood clotting important?
- Blood pressure stabilization is required to
properly deliver blood through the body. Inability to
clot can cause bleeding out and death.
- Blood is a thick stew of water, oxygen, cells of
nutrients and wastes, etc., warm, and red, and
slightly adhesive/viscous.
- Blood is slightly alkaline (pH is basic on the acid/base scale, with neutral at 7 and blood around
14).
- Blood should be .5-1*F warmer than the body.
o 98.6*F body temp = 99.5*F blood temp.
o 37*C Body temp = 37.6*C blood temp.
- Oxygen-rich blood is brighter and oxygen-poor blood is deeper, and color, temperature, and pH,
can indicate certain pathologies.
- 3 of the 5 liters of blood in the human body are
oxygen poor at any given time, returning to the
lungs/heart for reoxygenation. 1 of the 5 is
reoxygenated, and 1 is feeding the body.
- On average, for every 1 white blood cell, there
are 660 red blood cells. AKA about 6M red to 1K
white.
Plasma:
- Water: 90%
- Solutes: 10% - All the other nutrients, wastes,
gasses, hormones, etc.
- Formed Elements: 45%
- Leukocytes & thrombocytes (platelets): 1% of
the 45%
- Erythrocytes: 99.9% of the 45%
Homework____________________________________________________________________________
- NA - see you back here at our Zoom class on Tuesday 6/25 at 3pm-5pm CST
- Review Dr. Dan’s attachments to tonight’s email
Important Dates_______________________________________________________________________
- Test 2 of 3 Thursday July 11th: Circulatory System
- Test 3 of 3 Thursday July 25th: Remaining 6 Systems
- *Dates are subject to change at Dr. Dan’s discretion and will be