Human research and space biology filled the lab schedule aboard the International Space Station today. The Expedition 61 crewmembers are also ramping up for a trio of spacewalks set to begin next week.

NASA Flight Engineer Jessica Meir and Commander Luca Parmitano of ESA (European Space Agency) started Thursday collecting their blood samples. The duo spun the samples in a centrifuge and stowed them in a science freezer for later analysis. The astronauts also joined cosmonaut Alexander Skvortsov for a series of eye checks throughout the day.

Skvortsov also partnered up with cosmonaut Oleg Skripochka for cardiac research. After some Russian lab maintenance work, the pair also filmed educational activities to promote spaceflight for audiences on Earth.

Parmitano later tested how living in microgravity influences an astronaut’s perception of time. At the end of the workday, the ESA commander serviced a research incubator located in the Unity module.

Flight Engineer Andrew Morgan is setting up a mouse habitat in Japan’s Kibo laboratory module. The research facility is part of the Cell Biology Experiment Facility and enables the observation of rodents, which have a physiology similar to humans, in different gravity conditions.

Meir and fellow NASA astronaut Christina Koch are getting ready for two of three spacewalks planned for this month. The spacewalkers will work outside the station on Jan. 15 and 20 to replace older batteries with newer, more powerful batteries on the orbiting lab’s Port-6 truss structure. Morgan and Parmitano are targeting a third spacewalk on Jan. 25 to finish repairing the station’s cosmic particle detector, the Alpha Magnetic Spectrometer.