Physiology: Basic Concepts videos

Physiology: Basic Concept

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biophysics

Renal Physiology & Pathophysiology videos

Renal Physiology & Pathophysiology

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Gastrointestinal System Physiology & Patthophysiology videos

Gastrointestinal System Physiology & Pathophysiology

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Cardiovascular and Pathophysiology videos

Cardiovascular Physiology & Pathophysiology

videos 

anatomy of the heart

The heart is a muscular organ enclosed in a fi brous sac, the pericardium, and located in the chest The

inner layer of the pericardium is closely affi xed to the heartand is called the epicardium. 

The extremely narrow space between the outer wall of the pericardium and the epicardium is filled with a watery fluid that serves as a lubricant as the heart moves within the sac. The walls of the heart, the myocardium, are composed primarily of cardiac muscle cells. The inner surface of the cardiac chambers, as well as the inner wall of all blood vessels, is lined by  a thin layer of cells known as endothelial cells,

or endothelium.

Determinants of Venous Pressure

Determinants of Venous Pressure

The factors determining pressure in any elastic tube are the volume of fluid within it and the compliance of its walls.

Consequently, total blood volume is one important determinant of venous pressure because,as we will see, at any given moment most blood is in the veins. Also,the walls of veins are thinner and much more compliant than those of arteries.

Thus, veins can accommodate large volumes of blood with a relatively small increase in internal pressure.

Approximately 60 percent of the total blood volume is present in the systemic veins at any given moment

but the venous pressure averages less than 10 mmHg

In contrast, the systemic arteries contain less than 15 percent of the blood, at a pressure of nearly 100 mmHg.see this figure

26 Facebook Science Pages You Should Check Out

Facebook is a great social networking tool but it can also be used to learn new information. Facebook pages look like profile pages but are run by non-profits, celebrities, corporations, blogs, brands, and other organizations that want to share ideas and news.

A Moment of Science has gathered Facebook pages that provided excellent scientific information.

how does sympathetic nervous system increase myocardial contractility and heart rate?

Adrenergic receptors activate a G-protein-coupled cascade that includes the production of cAMP and activation of a protein kinase.

 A number of proteins involved in excitation-contraction coupling are phosphorylated by the kinase, which alters their activity. These include:

spherocytosis case study

CASE REPORT

HEREDITARY SPHEROCYTOSIS IN A 27-YEAR-OLD

WOMAN: CASE REPORT

Abstract

Hereditary spherocytosis (HS) is a familial hemolytic disorder with marked heterogeneity of clinical

features, ranging from an asymptomatic condition to a fulminant hemolytic anemia. Although a positive

family history of spherocytosis increases the risk for this disorder, it may be sporadic in some cases. In

severe cases the disorder may be detected in early childhood, but in mild cases it may go unnoticed

until later in adult life. A 27-year-old Nigerian woman

LH vs FSH: function in male

LH: Leydig cells stimulated to produce testosterone. FSH: Spermatogenesis stimulated

why increasing calcium concentration increase the force of contractility in case of cardiac muscles not in skeletal muscles?

 in skeletal muscles , a single action potential releases sufficient calcium to fully saturate the troponin sites that activate contraction.

but

Random facts

Random facts about your life

If you have 3 quarters, 4 dimes, and 4 pennies, you have $1.19. You also have the 

largest amount of money in coins without being able to make change for a dollar.

The numbers '172' can be found on the back of the U.S. $5 dollar bill in the bushes at

what you didn't know about animals

Animal fast facts

Mammals are the only animals with flaps around the ears.

African elephants only have four teeth to chew their food with.

cardiogenic shock case study

Case History

Patient

38-year-old female.

Chief Complaint

Severe headache, nausea, vomiting, and palpitations.

History of Present Illness

The patient presented to the emergency department (ED) with headache, nausea, vomiting, palpitations, severe dyspnea, diaphoresis, and nodal tachycardia that was treated with metoprolol.

Fast facts about your body

 Dr knowledge tells you fast facts about your body

The length from your wrist to your elbow is the same as the length of your foot.

Your heart beats 101,000 times a day. During your lifetime it will beat about 3 billion 

times and pump about 400 million litres (800 million pints) of blood.

It is impossible to lick your elbow. Well, for almost everyone… but a few can.

what you didn't know about animals

 Dr: knowledge tell you again what you didn't know about

Animals

 Mammals are the only animals with flaps around the ears.

African elephants only have four teeth to chew their food with.

acid-base balance of the blood

lungs and kidneys function to maintain the PH of blood plasma within a normal range 

the lungs regulate concentration of co2(respiratory )

the kidneys regulate bicarbonate HCO₃⁻(metabolic)

vertical transmission and transverse transmission of hereditary diseases:

*vertical transmission and transverse transmission of       hereditary diseases:

vertical transmission: the hereditary disease (mutation) is transmitted from one generation to the next one "to offspring".

smell things by google

What Does A Ghost Smell Like? Google Nose

Google is shutting down YouTube? Good riddance! There hasn’t been a video worth watching since