Which of the following best describes sti symptoms?
a. symptoms for stis are similar in nature and severity.
b. symptoms may not be present even though there is an infection.
c. visible symptoms are limited to the genital area.
d. symptoms can be treated with over-the-counter medication

The option that best describes STI symptoms is B. symptoms may not be present even though there is an infection. Sometimes, persons who have contracted a sexually transmitted infection aren't even aware of the fact that they are infected because there are no visible symptoms that may cause them problems. So, unprotected sex should be avoided at any cost, especially with strangers or people you don't really trust, so as to avoid STDs and unwanted pregnancies.

ahepatitis b

Muscles in the body us with a lot of things for example, if i wanted to lift a heavy box and had no muscle i would just collapse where i was because of the fact muscles hold us together. overall they are 650 muscle in the human body, all of them have different purposes and ways to keep us together. there are three types of muscle in the body skeletal, smooth, and cardiac muscle. skeletal muscle are attached to the bone and with movement. smooth muscle, this is found in the wall of our organs, such as our stomach, this muscle with movement   as well, without this muscle, we would only be allowed to eat small amounts. the cardiac muscle is the heart muscle and probably the most important one. these are only found in the walls of the heart and the heart pump blood to the other parts of your body. we have two different types of muscle fibers, slow twitch and fast twitch. slow twitch muscles enable long-endurance feats such as distance running. fast twitch fatigue faster but are used in powerful bursts of movements like sprinting. there are three different types of muscle contractions concentric, eccentric, isometric. concentric contraction causes muscles to shorten, thereby generating force.   eccentric contractions cause muscles to elongate in response to a greater opposing force. isometric contractions generate force without changing the length of the muscle.: //athleticquickness.com/muscle-contraction-types-part-1/