This compound is called latrotoxin.
No, they are not poisonous to humans. Their bite is non-lethal, but it will cause some pain.
A black spider with yellow stripes is a garden orb spider. These are very common and not poisonous to humans.
Black Widow
The spider which you are describing, being black and about the size of the palm of your hand in Ohio is likely a wolf spider. They are not aggressive but will bite if provoked. While not lethal to humans, a wolf spider bite will require medical attention as they are poisonous.
yes!
Jumping spiders are often mistaken for being dangerous, but they are not. The jumping spider is not poisonous to humans.
The Black Widow Spider
No. Lynx Spiders are not poisonous. For instance, birds can eat them without any problem. Humans sometimes cook and eat tarantulas. Lynx spiders, and most other spiders, are venomous. If a lynx spider bites you it will inject some venom. This venom is toxic to humans but not so toxic as to make a lynx spider bite a medical problem.
It's probably a black widow and yes very poisonous.
all spiders are venomous. but there are only two spiders in north America that have venom that can seriously harm a human, the black widow, and brown recluse, aka violin spider, and fiddleback. the green lynx spider is not venomous to humans though, but it does hurt to get bit!
The spider is probably a black widow, they are dangerous because they have extremely poisonous venom
Black Widow