BIOM 3200 Lecture Notes - Lecture 5: Superior Vena Cava, Pulmonary Valve, Tricuspid Valve

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champagneferret889

17 Oct 2017

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Lymphatic circuit collects interstitial fluid from body & brings it back to venous circulation: also plays major role in immune system, heart is in the center, providing driving force for blood distribution thru circulatory system. The heart: most critical component of cardiovascular system bc provides driving force for circulation. Myocardial nerves & myocardial (cid:862)pacemaker(cid:863) activity: normal heart beat is triggered by sinoatrial (sa) node specialized region of right atrium. Ca2+ flows in from extracellular fluid (ecf: produces rising (depolarizing) phase of action potential, which peaks slightly about 0mv, at this point, k+ channels open, making interior of plasma membrane increasingly negative. & creates falling (repolarizing) phase of action potential: when repolarization is complete, k+ channels close & pacemaker potential starts over, on its way to producing next heartbeat. Purkinje fibers at speed of ~4m/sec: consequently, entire ventricular myocardium depolarizes within 200msec after sa node fires, causing all muscle fibers in ventricles to contract nearly synchronously.

Related Questions

An important aspect of this qustion is relatively the need to understand the Cardiovascular System/Circulatory System, in order to answer the question. The main role of the cardiovascular system is to move blood through the body. The composition includes: Heart, capillaries, veins and arteries. The system moves oxygenated blood from the lungs and heart through the whole body via arteries. Blood also travels through the capillaries that are found between the arteries and veins. There are multiple diseases that affect the Cardiovascular System Angina, Arrhythmia, Congenital Heart Disease, Coronary Artery Disease, Myocardial Infarction, CHF, Hypertrophic Cardiomyopathy, Mitral Regurgitation, Mitral Valve Prolapse, Pulmonary Stenosis, etc. In Addition there are Vascular Diseases: Peripheral Artery Disease, Aneurism, Atherosclerosis, Renal Artery Disease, Raynauds Disease, Buergerâs Disease, Peripheral Venous Disease, Stroke, Venous Blood Clots, and Blood Clotting Disorders (American Heart Association, 2015). Multiple treatments exist for each and every one of these diseases, and hopefully more to come. American Heart Association. (2015). What is cardiovascular disease? Retrieved from http://www.heart.org.

rubysardine984

1. Which of the following is the correct sequence of bloodflow?

a. heart --> atery --> arteriole --> capillary -->vein --> venule --> heart

b. heart --> vein --> venule --> capillary -->arteriole --> artery --> heart

c. heart --> artery --> arteriole --> capillary -->venule --> vein --> heart

d. heart --> artery --> venule --> capillary -->arteriole --> vein --> heart

e. heart--> artery --> capillary --> arteriole -->venule --> vein --> heart

2. What are the functions of the elastic fibers that are foundin the walls of ateries? (there may be more than one answer)

Select one or more:

a. they allow the artery to stretch and then recoil back to itsoriginal shape as blood is forcegully pumped from the heart intothe arteries

b. they allow arteries to lengthen as the volume of blood in thearteries increase

c. they help maintain a steady blood pressure during thedifferent phases of heart contraction

d. they smooth out the walls of the arteries to preventturbulent blood flow

3. Which of the following are functions of the lymphatic system?(there may be more than one answer)

Select one or more:

a. help fight infections and cancer

b. allows excess interstitial fluid (fluid found between thecells in your tissues) to get dumped back into your blood

c. brings large molecules from fat digestion into thebloodstream so that they can be processed and stored

d. all of the above are functions of the lymphatic system

4. Which of the following blood vessels bring newly oxygenatedblood from the blood vessels in the lungs back to the heart so thatthe heart can pump it to the rest of the body?

Select one:

a. aorta

b. inferior vena cava

c. pulmonary vein

d. pulmonary artery

5. Which of the following mechanisms help blood fight gravity sothat, for instance, it can return from blood vessels in your feetback into your heart? (there may be more than one answer)

Select one or more:

a. breathing allows the pressure in your chest to decrease andallow blood to flow up towards your heart

b. as you walk, the skeletal muscles in your legs contract andsqueeze the veins; since veins have valves, blood flows up anddoesn't backflow back down

c. the force of blood flowing out of the heart and into thearteries pushes all of the blood along, causing blood to return tothe heart

d. precapillary sphincters open to allow blood to flow backtowards the heart

6. The tricuspid and bicuspid/mitral valves prevent backflow ofblood from the atria into the ventricles.

Select one:

True

False

7. The following sequence represents the correct order of bloodflow through the heart:

inferior and superior vena cava --> right atrium --> rightventricle --> pulmonary artery --> lungs --> pulmonaryvein --> left atrium --> left ventricle --> aorta

Select one:

True

False

8. Capillaries are as wide as one red blood cell.

Select one:

True

False

9. The purpose of the coronary arteries is to bring oxygenatedblood to the walls of the heart so that the muscles in the heartwalls can contract.

Select one:

True

False

10. Vasodilation refers to the narrowing of blood vessels.

Select one:

True

False

ultramarinealligator67

QuestionGroup: #37 CNS

Assigned as

Homework

Which parts of the brain contribute to our social behavior?

Orbitofrontal cortex

Mirror neurons

Amygdala

All of these are correct

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QuestionGroup: #38 CNS2

Assigned as

Homework

Part of the explanation of long term memory is which of the following?

Long term potentiation between neurons and muscle cells

Long term potentiation between neurons

Short term translation

Long term transcription

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QuestionGroup: #39 PNS

Assigned as

Homework

The somatic component of the peripheral nervous system has which of the following characteristics?

It controls the smooth muscle in the blood vessels so that blood vessels can vasoconstrict or vasodilate

It controls the autonomic nervous system so it indirectly controls heart rate

It controls your skeletal muscle so you can answer this question by pushing on the keyboard

It controls the smooth muscle in your intestinal tract so it controls peristalsis

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QuestionGroup: #40 Smooth/skeletal

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Homework

Which of the following is NOT a part of a skeletal muscle cell?

Motor neurons

Nuclei

Sarcomeres

Actin

Myosin

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QuestionGroup: #41 Cardio

Assigned as

Homework

Which part of the circulatory system has the highest pressure?

Veins

Capillaries

Arteries

Aorta

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QuestionGroup: #42 Cardio2

Assigned as

Homework

Where do the electrical signals originate in your heart?

SA node

Internodal tracts

His-Purkinje System

AV node

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QuestionGroup: #43 Blood pressure

Assigned as

Homework

There was a horrific traffic accident and you run to help the victims. You feel a pulse from his carotid artery ,however the medic comes along and gets no blood pressure as he measures it from the arm. He claims the victim is dead. You think which of the following?

Medic is not correct since it is the difference between heart rate and blood pressure that determines life. No heart rate only means tha the sympathetics have stopped vasoconstricting the blood vessels.

Medic is correct since it is common to not have a blood pressure of 120/80 and no pulse due to stress as was discussed in class.

Medic is incorrect since there is a pulse. This means the person is still alive.

Medic is correct since there is no blood pressure there is no life.

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QuestionGroup: #44 Blood pressure2

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Which side of the capillary bed has the higher oncotic pressure?

venous and lymph

arterial and lymph

lymph

venule side

arterial side

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QuestionGroup: #45 Capillaries

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If the hydrostatic pressure is higher in the interstitial space rather than the capillary, which of the following will occur?

(2),(3)

(1),(2),(3)

(3) Decreased hydrostatic pressure in the arterial end of the capillary

(2) Decreased hydrostatic pressure in the venous end of the capillary

(1) No change in the hydrostatic pressure since this pressure is maintained regardless of external pressures.

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QuestionGroup: #46 Respiration/ ventilation

Assigned as

Homework

The left atrium is damaged and is generating a great resistance to blood coming from pulmonary vein. What happens due to this pressure?

Back up of blood in the pulmonary artery which causes pulmonary capillary edema

Generation of back flow into the inferior vena cava

Generation of coronary artery edema

Back up of blood in the pulmonary vein which causes pulmonary capillary edema

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QuestionGroup: #47 Respiration/ventilation 2

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Homework

Edema in the pulmonary circulation refers to which of the following?

additional fluid in the trachea

additional interstitial fluid

additional surfactant

additional capillary fluid

additional intracellular fluid

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QuestionGroup: #48 Cell communication

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Homework

What is the definition of a signaling pathway?

All the proteins in the nucleus

All the cell molecules in the mitochondria

A group of genes that control mitosis

A specific chemical pathway that is activated by the ligand/receptor complex.

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QuestionGroup: #49 Hormone/ menstruation

Assigned as

Homework

Which hormone directly causes ovulation?

Follicle stimulating hormone

Lutenizing hormone

Progesterone

Estrogen

All of these

BIOM 3200 Lecture Notes - Lecture 5: Superior Vena Cava, Pulmonary Valve, Tricuspid Valve

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