NEET MDS Shorts
564048
AnatomyFacial Artery:
1: True, it has cervical and facial portions.
2: True, it arises from the external carotid artery above the lingual artery.
3: True, it crosses the mandible at the anterior edge of the masseter muscle.
4: False, the cervical portion lies beneath the platysma,
but the facial portion does not exactly lie "superficial in the carotid
triangle"; rather, the facial artery travels more superficially than the
cervical part in its course.
404419
AnatomyImmediately following the closure of the A-V valves is the period of
Isometric relaxation
632729
AnatomyThe artery chiefly responsible for blood supply to the mandible is inferior alveolar artery
114255
AnatomyThe occipital artery does not supply the lower third of the sternocleidomastoid (SCM) muscle:<br> Upper third: Supplied by the occipital artery <br>Middle third: Supplied by the superior thyroid artery and the external carotid artery <br>Lower third: Supplied by the suprascapular artery, the transverse cervical artery, the thyrocervical trunk, and the superficial cervical artery<br>
353761
AnatomyThe nerve to masseter passes posterior to temporomandibular joint
606565
AnatomyGag reflex is lost due to paralysis IX Nerve
The pharyngeal branch of IX nerve supply the mucosa of pharynx
866271
AnatomyThe largest resting membrane potential is observed in skeletal muscle.
Resting membrane potential (RMP) is the electrical potential difference across
the membrane of a cell when it is not undergoing an action potential or a
similar excitation. It is crucial for the functioning of excitable cells, such
as neurons and muscle cells, as it is the basis for the transmission of
electrical signals. The RMP is primarily determined by the concentration
gradients of ions across the cell membrane and the permeability of the membrane
to those ions.
In skeletal muscle cells, the resting membrane potential is typically around -90
millivolts (mV). This relatively high negative value is due to the higher
concentration of potassium ions (K+) inside the cell compared to the outside,
and the lower concentration of sodium ions (Na+) inside the cell compared to the
outside. The cell membrane is more permeable to K+ than to Na+ at rest, which
allows K+ to leak out through potassium channels and sets up the resting
membrane potential.
Smooth muscle cells, on the other hand, have a resting membrane potential that
is generally less negative than that of skeletal muscle cells. The typical RMP
in smooth muscle cells ranges from -40 to -70 mV, which is closer to the
threshold for depolarization and makes these cells more responsive to stimuli
that could cause contraction. The difference in RMP between smooth and skeletal
muscle is due to variations in ion channel expression and the activity of ion
pumps, which control the ionic composition of the intracellular and
extracellular environments.
To summarize:
1. Skeletal muscle cells have a resting membrane potential of approximately -90
mV.
2. Smooth muscle cells have a resting membrane potential that is generally more
positive than skeletal muscle cells, typically ranging from -40 to -70 mV.
213003
AnatomyIt attaches superiorly at the medial border of the mandible and inferiorly at the body of the hyoid