When myosin heads form cross-bridges during muscle contractions, they bind to binding sites found on _____, a component of thin filaments.
a. myosin
b. actin
c. intrafusal
d. extrafusal
e. myofibril
Answer: b. actin
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The tubercle of rib 4 articulates with the transverse costal facet of T3
Indicate whether this statement is true or false.
Match the following:
A) Lumbar plexus B) Brachial plexus C) Cervical plexus D) Sacral plexus 1) The obturator and femoral nerves branch from this plexus. 2) Striking the "funny bone" (ulnar nerve) may cause injury to a nerve of this plexus. 3) Trauma to a nerve of this plexus may cause wrist drop. 4) A fall or improper administration of an injection to the buttocks may injure a nerve of this plexus. 5) The phrenic nerve branches from this plexus.
The midpiece of the sperm tail contains mostly ________
Fill in the blanks with correct word
What are two benefits of having a portal system that connects the hypothalamus with the anterior pituitary gland? Are there any other endocrine axes connected by a portal system?
What will be an ideal response?