The answer is a solid yes for both.
Normally, the blood pressure in your ankle and upper arm is about the same. As a matter of fact, there is a vascular formula that measures the ratio between the ankle and brachial (upper arm) pressures as an indication of how well the circulation is to the lower extremities. This is also referred to as the ABI (ankle brachial index). The pressure measured in the ankle is as accurate as the arm.
The pulse oximeter
that detects heart rate
as well as saturation of hemoglobin
, normally applied to the fingers, can be applied to the toes (or ear lobes) as well.
See here: http://www.vascularweb.org/patients/NorthPoint/Ankle_Blood_Pressure_Measurement_ABI.html