BIO210Y5 Lecture 24: Lec 24 (17A) - Jan 31 (Circulation)

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hassan_rizvi96

4 Feb 2019

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Higher than venous because it takes effort to send the oxygenated blood against gravity. This increases as the arteries get smaller. Related to p1v1 = p2v2 (as the volume of vessel decreases, the pressure in the vessel increases) Peripheral resistance can be controlled by cns to increases the flow. This determines how much blood is going to fill the heart. This is blood returning to right atrium. Due to veins being closer to heart. Veins also have a greater diameter which means decreases in pressure. Also veins travel with gravity and so less effort to deliver deoxygenated blood to the heart. Friction between blood and vessel walls based on diameter and length of vessels. Longer vessels higher resistance & lower flow. Most resistance is near boundaries / surfaces of vessel. If you reduce the diameter of a vessel by half ( ) Ve;pcoty of blood flow is inversely proportional to resistance.

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c) How going from laying to standing affects arterial blood pressure in the head region?

When we are laying down the Mean Arterial Pressure (MAP) is at the same level of the heart which is about 100 mm Hg. When we try to stand up from the lying position, our head is placed above our heart and gravity starts to pull the blood back downwards to our heart and feet. Return of venous blood is reduced and this leads to a decrease in cardiac stroke volume and decline in mean arterial pressure which is reduced to 60-70 mm Hg. This decreases the flow of blood to head. In response to this reduction in arterial blood pressure in the brain, parasympathetic nervous system is withdrawn and sympathetic nervous system is activated to pump more blood to head region via increased heart rates.

d) How the baroreceptors reflex explains the higher HRs during standing

When a person stands up, baroreceptor reflexes are rapidly activated to restore arterial pressure so that mean arterial pressure normally is not reduced by more than a few mmHg when a person is standing compared to lying down. However, in order to maintain this normal mean arterial pressure, the person who is standing upright has increased systemic vascular resistance (sympathetic mediated), decreased venous compliance (due to sympathetic activation of veins), decreased stroke volume (due to decreased preload), and increased heart rate (baroreceptor-mediated tachycardia).

Question 6 (1 point)Save Question 6Save
When end-diastolic volume is increased, the force of the myocardialcontraction is increased. This is due to _________?

a shift in the operating point of the myocardial length-tensioncurve

an increased release of calcium

stretch-induced parasympathetic activity

a decreased afterload in the arteries
Question 7 (1 point)Save Question 7Save
Match the vessel characteristic on the left with the appropriatevessel type on the right (each vessel type will be used more thanonce, only 1 BEST answer for each characteristic).

Substance exchange with the tissues takes place in thesevessels

These vessels are the main site of vascular resistance

Active hyperemia directly affects the diameter of thesevessels

Very low resistance vessels that act as a pressure-reservoir due totheir elasticity

These vessels contain one-way valves throughout their length

The walls of these vessels are composed of a single layer ofendothelial cells and a thin basement membrane

Very low resistance vessels that serve as a volume reservoir due totheir compliance

The velocity of blood flow is the least in these vessels

These vessels carry blood back to the heart

Blood flow in these vessels is directly aided by the skeletalmuscle pump

The total cross-sectional area of this type of vessel(cross-sectional area of all these vessels combined) exceeds thetotal cross-sectional area of every other type of bloodvessel

These are the first vessels that carry blood away from theheart

1.
Arteries
2.
Arterioles
3.
Capillaries
4.
Veins
Question 8 (1 point)Save Question 8Save
Which of the following selections correctly completes thestatements: The primary mechanism via which gasses (oxygen andcarbon dioxide), ions, and nutrients are exchanged between thecapillaries and the tissue is ______.

Diffusion

Active transport

Bulk flow

More than one of the above is correct.
Question 9 (1 point)Save Question 9Save
Which of the following changes will favor an increase in absorptionat the capillaries?

An increase in plasma osmolarity.

An increase in interstitial fluid osmolarity.

An increase in capillary fluid hydrostatic pressure.

A decrease in interstitial fluid hyrdrostatic pressure.

More than one of the above selections is correct.
Question 10 (1 point)Save Question 10Save
Correct order the following events that would occur due to a dropin MAP.

Sympathetic activation increases and parasympathetic activationdecreases

Heart rate, stroke volume, cardiac output, and total peripheralresistance increase.

MAP rises.

Baroreceptor firing decreases

redhedgehog584

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

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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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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

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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

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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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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

Assigned as

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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

BIO210Y5 Lecture 24: Lec 24 (17A) - Jan 31 (Circulation)

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