The risorius muscle is primarily responsible for drawing the angle of the mouth laterally as in smiling. Major functions of the orbicularis oris and orbicularis oculi muscles include the shaping of the lips during speech and closing the eyes, respectively. The masseter muscle is the main muscle for mastication.  

The sternocleidomastoid muscle bilaterally causes flexion of the cervical vertebrae and extension of the head. Unilaterally, it can cause lateral flexion and rotation of the head to the side opposite of the contracting muscle. It originates on the sternum and clavicle and inserts onto the mastoid process.

The orbicularis oculi opens closes the eye. The muscle that opens the eye is called the levator palpebrae superioris.

The occipitofrontalis covers the skull from the occipital bone to the frontal bone. It is a muscle of facial expression.

Because it attaches superior to the hyoid bone, the geniohyoid does not depress the hyoid rather, it elevates it. The omohyoid (both inferior and superior bellies), the thyrohyoid, sternothyroid, and the sternohyoid muscles are collectively called the infrahyoid muscles, due to their attachments being inferior to the hyoid bone. Because of this attachment site, they depress the hyoid bone.

A spike in the concentration of luteinizing hormone (LH) leads to ovulation on day 14 of the menstrual cycle. This spike is known as the "LH surge" and is initiated by a positive feedback mechanism involving estrogen.

Follicle-stimulating hormone (FSH) is involved in the maturation of the follicle, but not ovulation. Progesterone functions in maintaining the endometrial tissue after implantation has occurred. Testosterone is not involved in the female reproductive cycle.

The muscle that surrounds the opening of the mouth is known as the Obicularis Oris. The Obicularis Oclui surrounds the eye. The Masseter is connected to the mandible and responsible for chewing.The Glossus muscles are found inside the mouth and responsible for tongue movement. The Buccinator is found deep to the Masseter located on the cheek.

The quadriceps muscle group consists of four different regions, each with a different origin. The rectus femoris originates on the anterior inferior iliac spine (AIIS). The vastus lateralis originates from the greater trochanter of the femur. The vastus medialis originates from the intertrochanteric line. The vastus intermedius originates from the shaft of the femur. Together, the muscles of the quadriceps work to extend the leg by straightening the knee.

The biceps femoris is located posterior to the femur, and is a part of the hamstring muscle group. The primary action of the biceps femoris is flexion of the leg by bending the knee.

The sartorius originates from the anterior superior iliac spine (ASIS) and inserts near the tibial tuberocity, running laterally to medially along the anterior thigh. Because the sartorius crosses both the hip and the knee, contraction of the muscle is capable of flexing both the leg and thigh. By running laterally to medially, shortening of the muscle also causes lateral rotation and abduction of the thigh.

Plantar flexion involves increasing the angle between the foot and the leg (pointing the toe). The gastrocnemius is found on the posterior portion of the leg, and is contracted in order to cause plantar flexion of the foot. The other muscle to contribute to this action is the soleus, also located in the posterior portion of the leg.

The tibialis anterior is located in the anterior portion of the leg and is involved in dorsiflexion, the opposite of plantar flexion. The biceps femoris and rectus femoris are located in the thigh, and do not act on the position of the foot. The biceps femoris is involved in flexion of the knee and the rectus femoris is involved in extension of the knee.