Flashcards For NEET Biology - Body Fluids and Circulation

Flashcards for NEET Biology are designed to boost your NEET preparation. Find below flashcards for Body Fluids and Circulation. These flashcards on Body Fluids and Circulation are prepared as per the NEET syllabus. This is helpful for aspirants of NEET and other exams during last-minute revision. Flashcards For NEET Biology – Body Fluids and Circulation, covers all the important points that are frequently asked in the exam. Check BYJU’S for the full set of Flashcards and Study material for NEET Biology. Solve NEET Biology MCQs to check your understanding and outperform in the exam.

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Name of the NEET sub-section
Topic
Flashcards helpful for
Biology
Body Fluids and Circulation
NEET exams

 

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Body Fluids and Circulation
Plasma 55% of blood

Contains- water (90-92%), Proteins (fibrinogen, albumins, globulins), minerals, glucose, lipids, amino acids, blood clotting factor

Serum Plasma without the clotting factors
Formed elements 45% of blood

Includes- Erythrocytes (RBC), Leucocytes (WBC) and Platelets

RBC Biconcave and without a nucleus, 5-5.5 million per cubic metre of blood

Hb- 12-16 g/dl of blood

Average lifespan 120 days

Graveyard of RBC- spleen

WBC Have nucleus, 6000-8000 per cubic metre of blood

Granulocytes and agranulocytes

Granulocytes Neutrophils (60-65%)- phagocytic

Eosinophils (2-3%)- allergic reactions

Basophils (0.5-1%)- secrete histamine, serotonin, heparin, involved in inflammatory reactions

Agranulocytes Monocytes (6-8%)- phagocytic

Lymphocytes (20-25%)- B and T, involved in the immune response

Thrombocytes Platelets, 1,500,00-3,500,00 per cubic metre of blood

Involved in blood clotting

Lymph Tissue fluid and contains lymphocytes

Fat is absorbed through lacteals

Transports, nutrients, hormones and involved in immune response.

Open circulatory system Blood flows through open spaces called sinuses

E.g. Arthropods, Molluscs

Closed circulatory system Blood flows through a closed network of blood vessels

E.g. Annelids, Vertebrates

Circulation in fishes Single circulation

Two chambered heart, 1-atrium, 1-ventricle

Incomplete double circulation In amphibians and reptiles, except crocodiles

Three chambered heart, 2-atria, 1-ventricle

Double circulation In crocodiles, aves and mammals

Four chambered heart, 2-atria, 2-ventricles

Human heart Origin- mesodermal

Four chambered and enclosed in the pericardium

Left atrium and ventricle- oxygenated blood

Right atrium and ventricle- deoxygenated blood

Tricuspid valve Between right atrium and right ventricle

Produces ‘lub’ sound at the time of closure

Bicuspid valve Mitral valve

Present between the left atrium and left ventricle

Produces ‘lub’ sound at the time of closure

Semilunar valve Present between- right ventricle and pulmonary artery, left ventricle and aorta

Produces ‘dub’ sound at the time of closure

SA node Sino-atrial node

Present in the right atrium at the upper right corner

Pacemaker of heart, generates action potential or impulses (70-75/min)

AV node Atrio-ventricular node

Present in the right atrium at the lower left corner

Cardiac output The volume of blood pumped by each ventricle- 5 l/min (70 ml in each cardiac cycle)
P-wave in ECG Excitation or depolarisation of atria

Leads to the initiation of contraction of atria

QRS complex in ECG Excitation or depolarisation of ventricles

Leads to initiation of contraction of ventricles

Number of QRS complex help in determining the heartbeats per minute

T-wave in ECG Repolarisation of ventricles and end of systole
Tunica externa Outer layer of arteries and veins, made up of fibrous connective tissues and collagen fibres
Tunica media Middle layer of arteries and veins, made up of smooth muscles and elastic fibres

Thin in veins

Tunica intima Inner lining of arteries and veins, made up of squamous endothelium
Pulmonary circulation Deoxygenated blood from right ventricle goes to lungs by pulmonary artery and then oxygenated blood from lungs comes to left atrium by pulmonary vein
Systemic circulation Oxygenated blood from left ventricle goes to aorta and to tissues by arteries and then deoxygenated blood from tissues are brought back to right atrium by veins and vena cava
Hepatic portal system Hepatic portal vein carries blood from digestive tract to liver before going to systemic circulation
Myogenic heart Autoregulation of normal heart activities, i.e. rhythmic contractions originate intrinsically
Neural regulation of cardiac activity Under the autonomic nervous system (ANS) control

Cardiac centres in medulla oblongata moderate heart activity

Sympathetic nerves- increase heartbeat and cardiac output

Parasympathetic nerves- decrease heartbeat and cardiac output

Hormonal regulation of cardiac activity Adrenal medullary hormones epinephrine and norepinephrine increase the heartbeat

Also Check:

NEET Flashcards: Breathing And Exchange Of Gases

NEET Flashcards: Excretory Products And Their Elimination

NEET Flashcards: Locomotion And Movement

NEET Flashcards: Neural Control And Coordination

NEET Flashcards: Chemical Coordination And Integration

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