Also, there are few species which have a stronger venom that could potentially be fatal or at least make the bite victim quite ill. 1  So while tarantula bites are unlikely to be fatal, you still want to avoid being bitten and the best way to do this is to learn about spider behavior and treat the spider accordingly.
To consent is to give permission, which could have been withheld. It implies a power relationship where the consent is granted by the party with more power. There is the political theory that says, governments can rule only with the consent of the governed. That is, the people consent to be governed and thus grant their power to the government. To assent is to agree with a statement made by an equal. On the Supreme Court, one justice writes the opinion of the majority, to which other justices assent. Those that disagree are said to dissent, that is to disagree. So, consent = permission while assent = agreement.
In summary, the difference between the two mechanisms - grant vs. contract mainly deals with the legal concept of default. If you do not deliver under a contract you are in default and can reasonably assume some justifiable action may be taken against the party that did not hold up its end of the deal.