Question

1. muscles that draw a body part toward the midline of the body and draw the fingers together in the hand are called ______. a) deltoids b) extensors c) adductors d) abductors 18. which of the following is the foot muscle that flexes the toes and helps with the maintenance of balance while standing and walking? a) abductor digiti minimi b) flexor digitorum brevis c) flexor digiti minimi d) abductor hallucis 19. the ____ controls involuntary muscle action and the action of the smooth muscles, glands, blood vessels, heart, and breathing. a) integumentary system b) skeletal system c) autonomic nervous system (ans) d) peripheral nervous system (pns) 20. motor nerves ____. a) carry messages from the sense organs to the brain and spinal cord b) are also known as afferent nerves c) carry impulses from the brain to the glands or muscles d) pass impulses to the brain and back through the sensory nerves to the muscles 21. the external carotid artery ____. a) supplies blood to the anterior parts of the face, neck, scalp, ear, and sides of the head b) supplies blood to the brain, eyes, eyelids, forehead, nose, and internal ear c) is on both sides of the neck d) divides into an internal and external branch 22. the ______ system is a significant part of the immune system, which helps defend against infection. a) endocrine b) lymphatic c) integumentary d) circulatory

Explanation:

1. Adductors draw body parts toward the mid - line. Deltoids are shoulder muscles, extensors extend joints, and abductors move parts away from the mid - line.
2. Flexor digitorum brevis flexes the toes and helps with balance while standing and walking. The other muscles have different functions related to toe movement but not specifically this balance - related toe - flexing.
3. The autonomic nervous system controls involuntary muscle action and smooth muscle, gland, blood vessel, heart, and breathing actions. The integumentary system is the skin system, the skeletal system is for support and movement related to bones, and the peripheral nervous system is a broader category that includes the autonomic nervous system but is not the most specific answer here.
4. Motor nerves carry impulses from the brain to the glands or muscles. Sensory nerves carry messages from sense organs to the brain and spinal cord and are also known as afferent nerves. The description in D is not the function of motor nerves.
5. The external carotid artery supplies blood to the anterior parts of the face, neck, scalp, ear, and sides of the head. The internal carotid artery supplies blood to the brain, eyes, etc. The external carotid artery does not divide into internal and external branches in that way, and it is not just on both sides of the neck in a non - functional description.
6. The lymphatic system is a significant part of the immune system that helps defend against infection. The endocrine system is related to hormones, the integumentary system is the skin barrier, and the circulatory system is for blood transport and has some immune - related functions but not as directly as the lymphatic system.

Answer:

1. C. adductors
2. B. flexor digitorum brevis
3. C. autonomic nervous system (ANS)
4. C. carry impulses from the brain to the glands or muscles
5. A. supplies blood to the anterior parts of the face, neck, scalp, ear, and sides of the head
6. B. lymphatic