Body Fluids and Circulation Class 11th NEET notes

 Circulatory System :

  • Circulatory Fluid - Blood, Lymph
  • Blood Vessels - Arteries, Capillaries 
  • Pumping Device - Heart-





Types of Circulation: 

Open v/s Closed Circulatory Systems-

• Arthropoda and Mollusca are Open         Circulatory system.
• Annelida and Chordata are Closed Circulatory System.

Single and Double Circulation-

1- Pulmonary Circulation (Lungs), Systemic Circulation (Tissue) are Single Circulation. 
Example - Fish (Two Chambered Heart)

2- Amphibia to Mammalia Double Circulation Present.
   

Basic Terms:

RA - Right Atrium
RV - Right Ventricle
LA - Left Atrium
LV - Left Ventricle

• Flow of blood in Systemic  Circulation -
LV---Aorta---Body Tissue----Vena Cava---RA

• Pulmonary Circulation -
RV---Pulmonary Artery---Lungs---Pulmonary Vein--LA.

In Crocodile Heartbeat is 4 Chambered.


                  Health Benefits              

   
              Human Heart:

Origin of Heart = Me sidereal
Weight Of Human Heart = 250 - 300gm
Position of Human Heart = +nt b/w Lungs in Mediastenum near the diaphragm in cardiac notch.
Note - Abnormal Position of heart  called Dextrocardia - Tilt toward Right

Covering of Heart - Pericardim - (fibrous, Parietal, Visceral Pericardium)
Wall of Heart- endocardium, Myocardium, Epicardium.
What is Valve?
•Double Fold of Endocardium With Muscular Flap

Valve Of Heart - Tricuspid + Bicuspid or Mitral Valve and Semilunar Valve.

Chordae Tindinae - +nt b/w cusoid valve and papillary muscles.
Conduction of Heart Beat - Mote mic
Nodal Tissue Show - Autorhytmicity
Types of Nodal Tissue?

1- SA Node(pacemaker)
2- AV Code(pacesetter)
3- Bundle of His
4- Purkinje Fiber
• SA node generate 70-75 impulse perAction potential per minutes .it is largest nodal tissue. 
• AV Node 60- 65 impulse/minute
• Bundle of His 40-45 impulse/minute
• Purkinje Fibre 20-25 impulse/minutes

                       (FAQ)

If Vagus Nerve cut?
heart beat rate increase  SA Node responsible for Rhythmicity of Heart.

If SA Node Non Functional?

Heart beat rate become arythmic in case we use artificial pacemaker.

                  Heart Sound:

• First heart sound is (LUB)
• Second heart sound is (DUB)