1.Human anatomyMedium
Which part of the brain is chiefly responsible for coordination and balance?
- AThalamus
- BCerebellum
- CMedulla oblongata
- DHypothalamus
Anatomy and Physiology: cram pack
Formula sheets, the key method steps for every topic and 4 practice problems, with full solutions at the back.
1Practice problems
2.Human anatomyHard
Which coronary artery most often supplies the sinoatrial (SA) node?
- ALeft anterior descending artery
- BCircumflex artery
- CLeft main coronary artery
- DRight coronary artery
3.Human physiologyMedium
What causes the first heart sound (S1)?
- AClosure of the aortic and pulmonary valves
- BBlood filling the atria
- CClosure of the mitral and tricuspid valves
- DOpening of the aortic valve
4.Human physiologyHard
Why does fetal haemoglobin have a higher affinity for oxygen than adult haemoglobin?
- AIt binds 2,3-BPG less strongly
- BIt contains more iron per haem
- CIt has five subunits instead of four
- DFetal blood has a higher pH
2Solutions
1.Human anatomy
Answer: B · Cerebellum
Why this is the answer
The cerebellum fine-tunes movement, posture and balance. Damage causes ataxia and an unsteady gait.
Answer
B · Cerebellum
2.Human anatomy
Answer: D · Right coronary artery
Why this is the answer
The SA nodal artery arises from the right coronary artery in roughly 60% of people and from the circumflex artery in the rest.
Answer
D · Right coronary artery
3.Human physiology
Answer: C · Closure of the mitral and tricuspid valves
Why this is the answer
S1 ("lub") is caused by closure of the atrioventricular valves at the start of systole. S2 ("dub") is closure of the semilunar valves.
Answer
C · Closure of the mitral and tricuspid valves
4.Human physiology
Answer: A · It binds 2,3-BPG less strongly
Why this is the answer
The gamma chains of HbF bind 2,3-BPG poorly, so the curve is shifted left. This lets fetal blood take oxygen from maternal blood in the placenta.
Answer
A · It binds 2,3-BPG less strongly
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