HUBS191 - Progress Test Prep Questions With Complete
Solutions
Hypotonic solution looks ____
fat/bloated
Hypertonic solution looks ___
shriveled
What does uneven distribution of molecules across the
membrane create?
A chemical gradient
What does uneven distribution of charges across the membrane
create?
An electrical gradient
What is the resting membrane potential?
The difference between the inside & outside of the cell
What are the 3 main types of muscle in the human body?
1. Smooth
2. Cardiac
3. Skeletal
What is the primary job of skeletal muscles and why is it
important?
To develop force which is important for movement and posture
Are skeletal muscles under voluntary control?
,Yes
What is the term for individual muscle cells?
Muscle fibres
What is the term for bundles of muscle fibres?
Fascicles
Which type of tissue is gathered together to form tendons?
Connective tissue
Muscle fibres are comprised of bundles of ____
Myofibrils
Myofibrils are made of repeating units called ____
Sarcomeres
Sarcomeres are made of contractile proteins called ____
Myofilaments
What are the two types of myofilaments?
1. Actin
2. Myosin
Muscle fibres are lined with a cell membrane which is named
____
Sarcolemma
What does SR stand for?
Sarcoplasmic Reticulum
What is EC-coupling?
, Excitation-Contraction Coupling
What is the job of the voltage-gated sensor (DHPR)
To receive signals from the t-tubules and interact with the
ryanodine receptors
What is the job of the ryanodine receptor (RyR)
Being a passive calcium channel on the SR that can open to
allow Ca2+ out into the cell
What is the job of the SR Calcium-ATPase (SERCA)
Being an active calcium pump that uses ATP to move Ca2+
back into the SR against its concentration gradient, ending the
excitation
Is actin a thick or thin filament?
Thin
Is myosin a thin or thick filament?
Thick
When actin and myosin bind together what needs to be present?
Calcium
When actin and myosin bind together in the presence of calcium
what can form?
Cross-bridges
How many stages are in the cross-bridge cycle?
5
Solutions
Hypotonic solution looks ____
fat/bloated
Hypertonic solution looks ___
shriveled
What does uneven distribution of molecules across the
membrane create?
A chemical gradient
What does uneven distribution of charges across the membrane
create?
An electrical gradient
What is the resting membrane potential?
The difference between the inside & outside of the cell
What are the 3 main types of muscle in the human body?
1. Smooth
2. Cardiac
3. Skeletal
What is the primary job of skeletal muscles and why is it
important?
To develop force which is important for movement and posture
Are skeletal muscles under voluntary control?
,Yes
What is the term for individual muscle cells?
Muscle fibres
What is the term for bundles of muscle fibres?
Fascicles
Which type of tissue is gathered together to form tendons?
Connective tissue
Muscle fibres are comprised of bundles of ____
Myofibrils
Myofibrils are made of repeating units called ____
Sarcomeres
Sarcomeres are made of contractile proteins called ____
Myofilaments
What are the two types of myofilaments?
1. Actin
2. Myosin
Muscle fibres are lined with a cell membrane which is named
____
Sarcolemma
What does SR stand for?
Sarcoplasmic Reticulum
What is EC-coupling?
, Excitation-Contraction Coupling
What is the job of the voltage-gated sensor (DHPR)
To receive signals from the t-tubules and interact with the
ryanodine receptors
What is the job of the ryanodine receptor (RyR)
Being a passive calcium channel on the SR that can open to
allow Ca2+ out into the cell
What is the job of the SR Calcium-ATPase (SERCA)
Being an active calcium pump that uses ATP to move Ca2+
back into the SR against its concentration gradient, ending the
excitation
Is actin a thick or thin filament?
Thin
Is myosin a thin or thick filament?
Thick
When actin and myosin bind together what needs to be present?
Calcium
When actin and myosin bind together in the presence of calcium
what can form?
Cross-bridges
How many stages are in the cross-bridge cycle?
5
