BIOLOGY PAPER 3 PRACTICAL EXAM, 2024.
What is the only artery in the body to carry blood that is poor in
oxygen? - CORRECT ANSWERS-Pulmonary Artery
What is the only vein in the body to carry blood that is rich in oxygen?
- CORRECT ANSWERS-Pulmonary Vein
What is the use of a defibrillator? - CORRECT ANSWERS-An
apparatus used to control heart fibrillation by application of an electric
current to the chest wall or heart.
What is Angina - CORRECT ANSWERS-Chest Pains
Two Types:
1. Stable: Exercise = Chest pains that go away
2. Unstable: Chest pains that don't go away
What are the risk factors that increase the risk of myocardial infarction
(MI)? - CORRECT ANSWERS-Smoking
Obesity
Physical Inactivity
Family History
Gender
Age
What is the action of the semilunar valves? - CORRECT ANSWERS-
Which two sites of the myosin heads on the thick filament are used to
generate a muscle's mechanical force? - CORRECT ANSWERS-Actin
binding site and ATPase
What is the name for the dark striation observed under the microscope
that is due to the overlap of thick and thin filaments? - CORRECT
ANSWERS-A band
, What does calcium do to help the muscle contract? - CORRECT
ANSWERS-Binds to troponin, exposing myosin binding sites
What happens in the power stroke? - CORRECT ANSWERS-Myosin
pulls actin toward the middle of the sarcomere
In addition to helping improve health in certain disease states, such as
diabetes, what does aerobic exercise do to healthy muscles? -
CORRECT ANSWERS-Increase mitochondria and decreases muscle
fiber diameter
What are the properties of fast glycolytic muscle, which has less red
blood vessels and mitochondria and dominates in white meat? -
CORRECT ANSWERS-Fast, strong contractions that fatigue quickly
When a muscle participates in light exercise, in which order does it
rely on energy sources? - CORRECT ANSWERS-Stored glycogen,
then blood glucose and fatty acids, then mostly fatty acids from the
blood
What is required to end a smooth muscle contraction? - CORRECT
ANSWERS-Phosphates enzymes in inactive myosin
The heart can relax completely and fill between contractions in part
because summation is not possible. Why can't summation of cardiac
muscle contractions occur? - CORRECT ANSWERS-Cardiac action
potentials are broad and last for hundreds of milliseconds
What are the large chambers of the heart that pump blood to the lungs
and body? - CORRECT ANSWERS-Ventricles
What is the order of vasculature from the left side of the heart to the
right side of the heart? - CORRECT ANSWERS-Arteries
Arterioles
Capillaries
Venules
Veins
What is the only artery in the body to carry blood that is poor in
oxygen? - CORRECT ANSWERS-Pulmonary Artery
What is the only vein in the body to carry blood that is rich in oxygen?
- CORRECT ANSWERS-Pulmonary Vein
What is the use of a defibrillator? - CORRECT ANSWERS-An
apparatus used to control heart fibrillation by application of an electric
current to the chest wall or heart.
What is Angina - CORRECT ANSWERS-Chest Pains
Two Types:
1. Stable: Exercise = Chest pains that go away
2. Unstable: Chest pains that don't go away
What are the risk factors that increase the risk of myocardial infarction
(MI)? - CORRECT ANSWERS-Smoking
Obesity
Physical Inactivity
Family History
Gender
Age
What is the action of the semilunar valves? - CORRECT ANSWERS-
Which two sites of the myosin heads on the thick filament are used to
generate a muscle's mechanical force? - CORRECT ANSWERS-Actin
binding site and ATPase
What is the name for the dark striation observed under the microscope
that is due to the overlap of thick and thin filaments? - CORRECT
ANSWERS-A band
, What does calcium do to help the muscle contract? - CORRECT
ANSWERS-Binds to troponin, exposing myosin binding sites
What happens in the power stroke? - CORRECT ANSWERS-Myosin
pulls actin toward the middle of the sarcomere
In addition to helping improve health in certain disease states, such as
diabetes, what does aerobic exercise do to healthy muscles? -
CORRECT ANSWERS-Increase mitochondria and decreases muscle
fiber diameter
What are the properties of fast glycolytic muscle, which has less red
blood vessels and mitochondria and dominates in white meat? -
CORRECT ANSWERS-Fast, strong contractions that fatigue quickly
When a muscle participates in light exercise, in which order does it
rely on energy sources? - CORRECT ANSWERS-Stored glycogen,
then blood glucose and fatty acids, then mostly fatty acids from the
blood
What is required to end a smooth muscle contraction? - CORRECT
ANSWERS-Phosphates enzymes in inactive myosin
The heart can relax completely and fill between contractions in part
because summation is not possible. Why can't summation of cardiac
muscle contractions occur? - CORRECT ANSWERS-Cardiac action
potentials are broad and last for hundreds of milliseconds
What are the large chambers of the heart that pump blood to the lungs
and body? - CORRECT ANSWERS-Ventricles
What is the order of vasculature from the left side of the heart to the
right side of the heart? - CORRECT ANSWERS-Arteries
Arterioles
Capillaries
Venules
Veins
