bio 1011-lecture f11-chapter 23-part 3

8/3/2019 Bio 1011-Lecture F11-Chapter 23-Part 3

1/22

11111

Circulation(Part 3)

Chapter 23


2/22

22

CirculatorySystems

The Human CardiovascularSystem and Heart

Structure and Function

of Blood Vessels

Structure and Function

of Blood

Chapter 23: Big Ideas


3/22

The cardiac cycle

The heart contracts and relaxes rhythmically.

The repeated contraction and relaxation ofpumping blood is called the cardiac cycle.The cycle consists of two main phases:

1. During diastole, blood flows from veins

into heart chambers.

2. During systole, blood flows

from atria

into ventricles.

3


4/22

The cardiac cycle:

4


5/22

The cardiac cycle:

5


6/22

The cardiac cycle:

6


7/22

The cardiac cycle

Cardiac output is the amount of blood pumped perminute from the ventricles.

Heart rate is the number of heart beats per minute.

Heart valves prevent the backflow of blood.

A heart murmur

is a defect in one or more heart valves that

permits a backflow of blood and

reduces the cardiac output.

7


8/22

The cardiac cycle

The SA (sinoatrial) node

generates electrical signals in atria and

sets the rate of heart contractions.

The AV (atrioventricular) node

relays these signals to the ventricles and

causes ventricular contraction.

8


9/22

31 2 4

ECGApex

Rightatrium

SA node(pacemaker) AV node Specialized

muscle fibers

Signals from theSA node spreadthrough the atria.

Signals aredelayed at theAV node.

Specialized musclefibers pass signalsto the heart apex.

Signals spreadthroughout theventricles.

The cardiac cycle:

9


10/22

The cardiac cycle

10


11/22

The cardiac cycle

11


12/22

CONNECTION:What is a heart attack?

A heart attack is damage or death of cardiac muscle and

usually results from a blocked coronary artery.

Cardiovascular diseases are disorders of theheart and blood vessels. These include

1. a stroke, death of brain tissue from blocked or

ruptured arteries in the head, and2. atherosclerosis, in which fatty deposits in the walls

of arteries narrow the blood vessels and restrictblood flow.

12


13/22

CONNECTION: What is a heart attack?

13


14/22

14

http://www.fda.gov/MedicalDevices/ProductsandMedicalProcedures/DeviceApprovals

andClearances/Recently-ApprovedDevices/ucm255199.htm

ION Paclitaxel-Eluting Coronary Stent System - P100023FDA Approval Date: April 22, 2011
http://www.fda.gov/MedicalDevices/ProductsandMedicalProcedures/DeviceApprovalsandClearances/Recently-ApprovedDevices/ucm255199.htmhttp://www.fda.gov/MedicalDevices/ProductsandMedicalProcedures/DeviceApprovalsandClearances/Recently-ApprovedDevices/ucm255199.htmhttp://www.fda.gov/MedicalDevices/ProductsandMedicalProcedures/DeviceApprovalsandClearances/Recently-ApprovedDevices/ucm255199.htmhttp://www.fda.gov/MedicalDevices/ProductsandMedicalProcedures/DeviceApprovalsandClearances/Recently-ApprovedDevices/ucm255199.htmhttp://www.fda.gov/MedicalDevices/ProductsandMedicalProcedures/DeviceApprovalsandClearances/Recently-ApprovedDevices/ucm255199.htmhttp://www.fda.gov/MedicalDevices/ProductsandMedicalProcedures/DeviceApprovalsandClearances/Recently-ApprovedDevices/ucm255199.htm


15/22

15

CONNECTION:Measuring blood pressure

A typical blood pressure for a healthy youngadult is about 120/70.

Blood pressure is commonly measured using asphygmomanometer.

Hypertension is a serious cardiovascularproblem in which blood pressure is persistent ator above

140 systolic and/or

90 diastolic.


16/22

CONNECTION: Measuring blood pressure

16


17/22


17


18/22


18


19/22


19


20/22

20

CONNECTION: Blood pressure andcardiovascular problems

Hypertension causes

the heart to work harder, weakening the heart overtime,

increased plaque formation from tiny ruptures, and increased risk of blood clot formation.

Hypertension can contribute to

heart attacks,

strokes, and/or

kidney failure.


21/22

21

http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm234350.htm

One year ago (this week):

Darvon and Darvocetpulled from the market

What do you think?
http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm234350.htmhttp://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm234350.htmhttp://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm234350.htmhttp://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm234350.htm


22/22

Quiz: Myths and Facts About YourHeart Health

http://www.webmd.com/heart-disease/rm-quiz-heart-disease-myths

22
http://www.webmd.com/heart-disease/rm-quiz-heart-disease-mythshttp://www.webmd.com/heart-disease/rm-quiz-heart-disease-mythshttp://www.webmd.com/heart-disease/rm-quiz-heart-disease-mythshttp://www.webmd.com/heart-disease/rm-quiz-heart-disease-mythshttp://www.webmd.com/heart-disease/rm-quiz-heart-disease-mythshttp://www.webmd.com/heart-disease/rm-quiz-heart-disease-mythshttp://www.webmd.com/heart-disease/rm-quiz-heart-disease-mythshttp://www.webmd.com/heart-disease/rm-quiz-heart-disease-mythshttp://www.webmd.com/heart-disease/rm-quiz-heart-disease-mythshttp://www.webmd.com/heart-disease/rm-quiz-heart-disease-mythshttp://www.webmd.com/heart-disease/rm-quiz-heart-disease-mythshttp://www.webmd.com/heart-disease/rm-quiz-heart-disease-mythshttp://www.webmd.com/heart-disease/rm-quiz-heart-disease-myths

bio 1011-lecture f11-chapter 23-part 3

Documents