They make diamond wire/cable saws for stuff like this. Maybe something like that would work?

No, they're not the same kind of tissue, but they can be interchanged, to a degree. For coronary artery bypass, the saphenous vein (a leg vein) is often used.

Arteries have thicker walls than veins, and a thicker layer of muscle inside them. Except for the pulmonary artery, arteries lack valves. Veins are thinner-walled, with a thinner muscle layer. They also have valves. These valves prevent blood from pooling and flowing backward (gravity and all that), and, because venous pressure is lower than arterial pressure, the valves "help" pump deoxygenated blood back to the heart.

Edited to add that veins and arteries can also purposefully be connected together to create an arteriovenous fistula, for dialysis access. Arteiovenous fistulas can also occur naturally, as congenital defects.

Gorillas use columnar knucke-walking, where the wrist and hand joints are aligned in a relatively neutral, straight position, which helps with weight bearing. Gorillas are not as arboreal (tree-dwelling) as chimpanzees, so their form of knuckle-walking evolved to maximize terrestrial movement, as well as the aformentioned weight-bearing.

Chimpanzees knuckle-walk with extended wrists, which is due to the fact that they, like most primates, extend their wrists to preserve their balance while engaging in arboreal activities. Due to this need to extend their wrists to preserve balance and protect themselves in an uncontrollable fall, the chimpanzee's wrist bone anatomy has evolved to differ from that of a gorilla, which results in a different form of knuckle-walking.

Radical historical shift? Look around you. Women are still villified, to this day, for daring to enjoy sex. And as equally villified if we don't have sex with a man who feels entitled to our bodies. We're still either "temptresses with supernatural powers out to ruin men with their devil's pocket" or "prude femoids who only put out for alpha chads", depending on who you talk to.

So yeah, history hasn't changed. Still men trying to push the natrrative surounding women's libido and women's bodily autonomy (not to mention mens' often disgustingly-incorrect knowledge of the female anatomy).

My point is, throughout history, men have been wrong in their assumptions about the female libido, whether they thought it was higher or lower. And even to this day, men will still swear up and down one way or the other. It's an individual thing.

It actually usually restarts on it's own. Sometimes a mild electric shock is used to restore normal rhythm, or the surgeon may massage the heart to get it going.

Defibrillation uses an electric shock to convert abnormal heart rhythms, called fibrillations, into a normal heartbeat (called a sinus rhythm). Defibrillation causes much of the heart muscle to depolarize (a change in electric charge within a cell). This depolarization causes the sinoatrial node (your heart's natural pacemaker) to reestablish sinus (normal) rhythm.

With cardiopulmonary bypass, you're actually weaned off the machine. Your body is re-warmed (they cool you down, which actually reduces risks of brain damage and other issues that arise from being put on the bypass), and your arterial blood gas will be measured. Arterial blood gas is a measurment of how much oxygen is in your bloodstream. It is measured via a blood sample from the arteries. Then, the anesthesiologist turns back on silenced alarms (they don't want to hear the flatline (no heartbeat) alarm throughout the surgery, so the monitor is put on "silence"), adjusts monitor and ventilator settings, and adjust oxygen flow rate, as necessary.

After the aorta is de-clamped, the heart usually starts to beat without help, but sometimes drugs (called inotropes- they are drugs that "tell" your heart muscles to contract; some inotropic drugs "tell" heart muscles to contract with more force; other inotropes "tell" heart muscles to contract less forcefully) are needed.

Cardiac (the medical term for anything to do with the heart) massage may also be needed to get the heart restarted. The medical personnel will use their hand and directly massage the heart itself. It's basically direct compressions, like in CPR, but instead of using the force from your arms and hands over the sternum (breastbone) to "massage" the heart back to beating, it's directly to the heart muscle itself.

It does sometimes beat irregularly at first, and an electric shock directly applied to the heart muscle may be needed to restore sinus rhythm, much like in automatic external defibrillation. Sometimes, the heart will fail to maintain a normal rhythm, and an internal pacemaker (a device that shocks the heart into sinus rhythm) may be implanted.

Another word for spay (or neuter is) sterilization.

Sterile -

not able to produce children or young.

So, OP isn't wrong for calling her cat sterile.