WorksheetsIntro BMe Exam 3 review
Total questions: 26
Worksheet time: 13mins
What limits the resolution of light microscopes?
Pixel count
Lens sharpness
Diffraction
Light color
Which interaction of light leads to the ability to see interference patterns?
Refraction
Diffraction
Polarization
Reflection
Why isn't X-ray microscopy widely used?
Not enough resolution
Too slow to generate images
X-rays are hard to bend and may damage the sample
No lenses exist
What is the primary pacemaker of the heart?
AV node
Purkinje fibers
Bundle of His
SA node
The AV node’s key function is to:
Pump blood
Delay conduction so atria empty before ventricles contract
Oxygenate blood
Create antibodies
Which waveform represents atrial depolarization?
P wave
QRS complex
T wave
U wave
The QRS complex signifies:
Atrial repolarization
Ventricular depolarization
Ventricular relaxation
AV node firing
Tachycardia is defined as heart rate above:
80 bpm
90 bpm
100 bpm
200 bpm
Bradycardia is defined as heart rate below:
50 bpm
60 bpm
70 bpm
100 bpm
Purkinje fibers:
Slow conduction only
Rapidly propagate signals through ventricles
Control atrial contraction
Produce blood
Gap junctions allow movement of molecules smaller than:
100 Da
500 Da
1000 Da
1500 Da
What does a pacemaker do?
Measures heart rate only
Continuously regulates cardiac electrical activity
Pumps blood when ventricles fail
Records EKG waves
Defibrillators treat fibrillation by:
Slowing heart rate
Delivering shock to reset electrical rhythm
Stimulating only the SA node
Heating cardiac tissue
Ventricular fibrillation is best described as:
Slow, coordinated beats
Uncoordinated electrical activity in ventricles
Damage to AV node only
Missing T wave
Ionic bonds occur due to:
Electron transfer
Sharing electrons
Peptide linkage
Covalent stacking
Hydrogen bonds form between:
Non-polar molecules only
Polar molecules in weak interactions
Metals
Isotopes
Total body water is approximately:
12 L
28 L
42 L
100 L
Intracellular fluid volume in the body:
3 L
11 L
28 L
42 L
The Central Dogma flows as:
Protein → RNA → DNA
DNA → RNA → Protein
RNA → Protein → DNA
DNA → Protein → RNA
An allograft transplant comes from:
The same person
Same species, genetically different donor
Identical twin
Different species
First stage of wound healing:
Proliferation
Remodeling
Hemostasis
Inflammation
Which immune system is fast and non-specific?
Adaptive
Innate
Blood-borne
Lymph-only
B-cells produce:
Neurotransmitters
Antibodies
Platelets
Digestive enzymes
Reynolds number <2100 indicates:
Turbulent flow
No flow
Laminar flow
Random flow
When the AV node fails but the HIS-Purkinje system remains intact, what happens to the heart rhythm?
The heart stops completely
A slower ventricular rhythm maintains contraction
trial rate increases to maintain output
Purkinje fibers prevent all electrical conduction
During ventricular depolarization, why is the QRS complex much larger in amplitude than the P wave?
Ventricles depolarize slower
Atria are electrically insulated
Ventricles have more muscle mass therefore larger electrical signal
T wave overlaps and cancels the P wave
