A nurse notices that a patient has difficulty detecting temperature changes. Which layer of skin is most likely affected?

A. Isovolumetric contraction: This phase occurs at the beginning of ventricular systole, where the ventricles contract with no change in volume because all valves are closed, and it does not involve filling.

B. Diastole: Diastole is the phase of the cardiac cycle when the ventricles relax and fill with blood from the atria. It ensures adequate ventricular volume before the next contraction, allowing efficient circulation.

C. Systole: Systole refers to ventricular contraction, during which blood is ejected into the aorta and pulmonary artery, not filling.

D. Ejection phase: The ejection phase is part of systole when the ventricles pump blood into the arteries. Ventricular filling occurs prior to this phase during diastole.

A. Detection of chemical changes: Chemoreceptors respond to chemical stimuli, such as changes in oxygen, carbon dioxide, or pH, rather than mechanical forces.

B. Detection of mechanical stimuli such as pressure and vibration: Mechanoreceptors are specialized to sense physical deformation of tissues, including pressure, vibration, touch, and stretch, providing critical information about the environment and body position.

C. Detection of light stimuli: Photoreceptors in the eyes detect light and are not involved in sensing mechanical changes.

D. Detection of temperature changes: Thermoreceptors respond specifically to heat or cold, not to mechanical forces like pressure or vibration.