BIOL 320: EXAM 2
REVIEW (CH. 20, 21, 22)
What are the two circulations of the heart? - CORRECT
REPLY>>>>>>-Pulmonary Circulation: The right side of the
heart pumps blood through the pulmonary circulation, which
carries blood to the lungs, where CO2 diffuses from the blood
into the lungs & O2 diffuses from the lungs into the blood. It
returns the blood to the left side of the heart.
- Moves blood from the right side of the heart to the lungs &
back to the heart.
Systemic Circulation: The left side of the heart then pumps
blood through the systemic circulation, which delivers O2 and
nutrients to all the remaining tissues of the body. From those
tissues, CO2 and other waste products are carried back to the
right side of the heart.
,- Moves blood from the left side of the heart to the head &
body and returns it to the right side of the heart to repeat the
cycle
True or False
The heart is the first/earliest organ to form and begin
function in human embryo? - CORRECT REPLY>>>>>>-True
How many valves does the heart have? - CORRECT
REPLY>>>>>>-Four
What are the valves of the heart? - CORRECT
REPLY>>>>>>-Tricuspid: Between the right atrium & right
ventricle
Mitral or Bicuspid: Between the left atrium & left ventricle
Pulmonary: Between the right ventricle & pulmonary artery
Aortic: Between the left ventricle & the aorta
What is the wall of the heart made of? - CORRECT
REPLY>>>>>>-Cardiac muscle
, What wall of the heart is thicker and why? - CORRECT
REPLY>>>>>>-The left ventricle is the thickest because it
pumps oxygenated blood everywhere in the body (longer
distance)
What is the heart histology of the cardiac muscle? -
CORRECT REPLY>>>>>>-Myocytes -> Myofibrils ->
Sarcomeres
Contraction starts in sarcomeres -> then contracts myofibrils -
> thirdly, contracts myocytes -> Finally, contracts the whole
heart
- Myocytes are a tubular structure composed of chains of
myofibrils (rod-like units within the cell). Cells in the heart.
They contain thousands of myofibrils.
- Myofibrils are composed of numerous sarcomeres
- Sarcomeres are composed of myofilaments of myosin &
actin (interact using the sliding filament model cross-bridge
cycle to contract)
REVIEW (CH. 20, 21, 22)
What are the two circulations of the heart? - CORRECT
REPLY>>>>>>-Pulmonary Circulation: The right side of the
heart pumps blood through the pulmonary circulation, which
carries blood to the lungs, where CO2 diffuses from the blood
into the lungs & O2 diffuses from the lungs into the blood. It
returns the blood to the left side of the heart.
- Moves blood from the right side of the heart to the lungs &
back to the heart.
Systemic Circulation: The left side of the heart then pumps
blood through the systemic circulation, which delivers O2 and
nutrients to all the remaining tissues of the body. From those
tissues, CO2 and other waste products are carried back to the
right side of the heart.
,- Moves blood from the left side of the heart to the head &
body and returns it to the right side of the heart to repeat the
cycle
True or False
The heart is the first/earliest organ to form and begin
function in human embryo? - CORRECT REPLY>>>>>>-True
How many valves does the heart have? - CORRECT
REPLY>>>>>>-Four
What are the valves of the heart? - CORRECT
REPLY>>>>>>-Tricuspid: Between the right atrium & right
ventricle
Mitral or Bicuspid: Between the left atrium & left ventricle
Pulmonary: Between the right ventricle & pulmonary artery
Aortic: Between the left ventricle & the aorta
What is the wall of the heart made of? - CORRECT
REPLY>>>>>>-Cardiac muscle
, What wall of the heart is thicker and why? - CORRECT
REPLY>>>>>>-The left ventricle is the thickest because it
pumps oxygenated blood everywhere in the body (longer
distance)
What is the heart histology of the cardiac muscle? -
CORRECT REPLY>>>>>>-Myocytes -> Myofibrils ->
Sarcomeres
Contraction starts in sarcomeres -> then contracts myofibrils -
> thirdly, contracts myocytes -> Finally, contracts the whole
heart
- Myocytes are a tubular structure composed of chains of
myofibrils (rod-like units within the cell). Cells in the heart.
They contain thousands of myofibrils.
- Myofibrils are composed of numerous sarcomeres
- Sarcomeres are composed of myofilaments of myosin &
actin (interact using the sliding filament model cross-bridge
cycle to contract)
