35241

47790

Chronic granulocytic leukemia is due to chromosomal translocation.

10327

Zonography is a type of panoramography.

11166

Explanation: The external shape of a Class V amalgam restoration is closely related to the contour of the marginal gingiva. This is important for aesthetic and functional reasons, as the restoration must blend seamlessly with the surrounding gingival tissue. The outline form should respect the natural contours to minimize plaque accumulation and promote periodontal health. While axial line angles and the direction of enamel rods are relevant to the preparation, they do not primarily dictate the external shape of the restoration.

21505

Hyaluronidase is an enzyme that breaks down hyaluronic acid, a component found in the extracellular matrix. When added to a local anesthetic, it increases the permeability of tissues, facilitating enhanced diffusion of the anesthetic agent into the surrounding areas. This can broaden the spread of the anesthetic, allowing for a more effective and comprehensive blockade of nerve signaling.

96687

Trisomy 13 is associated with congenital anomalies such as a small head, small eyes, and congenital heart defects.

77058

Cutaneous anthrax is primarily caused by entry through the skin, often through abrasions or cuts.

50910

In endodontics, the primary goal of using gutta-percha is to achieve a proper seal at the apex of the root canal system. A definite apical seal is crucial to prevent the ingress of bacteria and fluids, which can lead to reinfection. While the cone should fit well within the canal, the emphasis is on achieving a good seal rather than merely fitting exactly at the apex or being 2 mm from it.

47516

The 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.

38929

The normal adult respiratory rate is typically between 12 and 16 breaths per minute.